Title of Invention

DEVICE AND METHOD FOR APPLYING LAYERS OF A POWDER MATERIAL

Abstract A device ( 51) for applying layers or a powder material ( 71) by means of an application device ( 52) is described, wherein the application device ( 52) can be moved back and forth between two end positions in order to apply a layer of material (71) and the application device ( 52) comprises a blade (56) for removing excess material during the application of a layer of material (71). The device (51) is characterized by a material transport device (53), by which the material can be transferred from one side of the blade ( 56) to the other side of the blade. The device has the particular advantage that layers of material (71) can be applied without any loss of material and is particularly applicable in a laser sintering device.
Full Text PCT/EP2006/002572
EOS GmbH
Electro Optical Systems.
DEVICE AND METHOD FOR APPLYING LAYERS OF A POWDER MATERIAL
ONTO A SURFACE
The present invention is related to a device and a method for
applying layers of a powder material onto a surface according
to the preamble of claims 1 and 12, respectively, as well as to
a device for manufacturing a three-dimensional object according
to the preamble of claim 19.
Such a device and such a method for applying layers of a powder
material are known e. g. from DE 195 14 740 Cl. The application
device described in DE 195 14 740 Cl with respect to a laser
sintering device comprises a single blade, which shifts a sup-
ply of material in front of it when applying a layer. Here, the
problem is that the supply of material for a layer either is
too small, so that no complete layer can be applied within the
work space ( production area), or else that the supply is larger
than the amount that is necessary for one layer, so that excess
material is shifted out of the work space to the outside. This
excess material is no longer used for the application of a fur-
ther layer. Therefore, it has to be collected in special col-
lecting receptacles and contributes to an increased material
consumption.
From EP 945 202 A2 a application device having two blades is
known. Like the application device described in DE 195 14 740
Cl also this application device has the problem that while a
layer is applied, excess material in front of the leading blade

2
in the direction of movement of the application device is
shifted out of the work space to the outside. Also here, this
material, which is shifted to the outside by the blade, is not
used for the application of a further layer and therefore con-
tributes to an increased material consumption as above.
The material to be applied may consist of various materials
such as polymers, metals, ceramics or composite materials. De-
pending on the material and the process control in a device for
manufacturing a three-dimensional object a heating of the lay-
ers can be applied. In this case the material that has been ac-
cumulated in the peripheral region can be thermally damaged
during the manufacturing of a three-dimensional object depend-
ing on the material, in particular when using polymers, and
thus may become useless for a re-use.
Therefore, the object of providing a device and a method for
applying layers of a powder material, by which the layers may
be applied reliably and without any loss of material, forms the
basis of the present invention.
The object is achieved by a device and a method, respectively,
for applying layers of a powder material according to claims 1
and 12, respectively.
The invention has the advantage that the material, which is
shifted by a blade of the application device from the work
space to the outside while a layer is applied, is reused for
the application of the next layer. Therefore, no loss of mate-
rial occurs.
When using a supply system, where the supply of material to a
supply area is halted when a predetermined amount of material

3
is present in the supply area, a self-regulating dosage of the
material supply occurs, even when the excess material incurred
while a layer is applied is transported by the blade into the
supply area.
A further advantage of the invention is that the thermal stress
of the material that accumulates in excess when a layer is ap-
plied, is small.
When an elevated process temperature is needed, the use of a
material transport system having a heated tray has the advan-
tage that the material is preheated before the application as a
layer. Thereby, the building time is reduced.
When using a material transport device formed as fluidization
device, wherein the fluidization occurs through a pre-heated
gas, there is the advantage that the fluidized powder is pre-
heated and thus the building time can be shortened, in case an
elevated process temperature is needed.
Further features and advantages of the invention will arise
from the description of embodiments by means of the accompany-
ing drawings, of which:
Fig. 1 shows a schematic diagram of a laser sintering device
having the device according to the invention;
Fig. 2 shows a schematic diagram of a first embodiment of the
device for applying layers of a powder material;
Fig. 3-5 show the device for applying layers of a powder ma-
terial of Fig. 2 in different phases of its operation; and

4
Fig. 6 shows a schematic drawing of a second embodiment of the
device for applying layers of a powder material.
Fig. 1 shows a laser sintering device as embodiment of a device
for manufacturing a three-dimensional object, in which the de-
vice according to the invention and the method according to the
invention are used. The laser sintering device has a container
1 open to the top. A support 2 for supporting the object 3 to
be formed is provided in the container 1. The support 2 can be
moved in the container 1 in the vertical direction A up and
down by means of a drive 4. The upper edge of the container 1
defines a work plane 5 ( construction field). An irradiation de-
vice 6 in the form of a laser, which emits a directed laser
beam that is deflected onto the work plane 5 by a deflection
device 7, is arranged above the work plane 5. Moreover, an ap-
plication device 8 for applying a layer of the powder material
to be solidified onto the surface of the support 2 or a previ-
ously solidified layer is provided. The application device 8
can be moved back and forth across the work plane 5 between two
end positions by a drive that is schematically indicated by the
arrows B. The application device is fed from two powder supply
containers 10 via two material supply devices 9 at the left
side and the right side of the construction field as well as
two material transport devices 11.
Moreover, the device comprises a heating device 12 arranged
above the work plane 5 for pre-heating an applied but not yet
sintered powder layer to a working temperature TA suitable for
the solidification and the sintering, respectively.
A temperature measuring device 13 in the form of e.. g. a pyrome-
ter or IR camera, which serves for measuring the temperature of
the previously applied powder layer or top powder layer in a

5
measurement area 14, is provided at a distance above the work
plane 5.
The work plane is secluded from the environment by a process
chamber 16. Thereby, the oxidation of the powder may be pre-
vented, if necessary.
A control and/or regulation device 17 serves for controlling
and/or regulating the movement B of the application device 8,
the movement A of the support 2, the power of the heating de-
vice 12, the power of the irradiation device 6 and the deflec-
tion by a deflection device 7. For this purpose the control
and/or regulation device 17 is connected to the drive of the
application device 8, the drive 4, the heating device 12, the
temperature measuring device 13, the deflection device 7 as
well as the irradiation device 6.
Fig. 2 shows a first embodiment of the device for applying lay-
ers of a material in powder form.
The device 51 for applying a layer of a material in powder form
according to a first embodiment comprises an application device
52, a material transport device designed as conveyor roller 53
as well as a material supply device designed as a feeding chute
54.
The application device 52 is movable back and forth between two
end positions above a work plane 55 ( construction field) by a
drive indicated by the arrow B. It comprises a blade 56, a
first actuation element 57 and a second actuation element 58.
The conveyor roller 53 has two paddles 60, 60' that are rotat-
ing around a common axis 59. Perpendicular to the axis 59 a cam

6
plate 61 having two cams 61a and 61b is fixed to the conveyor
roller 53 .
Each of two oblong con-rods 62, 62' has a first end that is
connected to the cam plate 61 in such a way that an eccentrical
rotation is possible. Each con-rod 62, 62' has at its other,
second, end a hook-shaped portion 62a and 62a' , respectively,
which serves as point of application for the second actuation
element 58 of the application device. The axes or rotation 63,
63' , around which the two con-rods 62, 62' are rotatable with
respect to the cam plate 61, together with the axis 59 are lo-
cated in a common plane and are parallel to the axis 59. The
con-rods 62, 62' in each case have an elongated hole 62b and
62b' , respectively, between the first and the second end. The
movement of the con-rods 62, 62' is guided by a pin 64 inserted
into both elongated holes 62b, 62b' , wherein the pin can not be
moved with respect to the position of the conveyor roller. The
elongated holes 62b, 62b' are designed such that both hook-
shaped portions 62a, 62a', when the conveyor roller is rotated,
do not only move parallel to the work plane 55 due to the guid-
ance by the pin 64, but also do move up and down perpendicu-
larly to the work plane.
When looking in the direction of movement B of the application
device, the conveyor roller is located in a trough 65 provided
with a heating 66 at the side of the work plane 55. This trough
65 is adapted to the conveyor roller 53 such that the ends of
the paddles 60, 60' move along the wall of the trough when the
conveyor roller 53 is rotated in the trough 65.
The feeding chute 54 is located at the side of the trough 65
facing away from the work plane 55. The feeding chute 54 serves
for feeding the powder for the manufacturing of a powder layer
to the application device 52.

7
In the following the operation of the previously described la-
ser sintering device corresponding to a method according to a
first embodiment is described.
As illustrated in Fig. 2, initially a first powder layer 71 is
applied onto the support 2 or a previously solidified layer by
moving the application device 52 in parallel to the work plane
55. In the process excess powder 72 is moved out of the con-
struction field to the outside by the blade 56.
In an operating stage of the device according to the first em-
bodiment, which is shown in Fig. 2, the first paddle 60 is po-
sitioned below the work plane 55 and the application device ap-
proaches the conveyor roller 53 in order to produce a first
layer 71 of the material in powder form. Finally, the above-
mentioned excess material 72 is pushed by the blade 56 onto the
first paddle 60 ( for clarity reasons in Fig. 2 no powder is
shown in the material transport device) .
In a stage of operation of the device shown in Fig. 3 the ap-
plication device pushes against the cam 61b with the first ac-
tuation element 57 and rotates the conveyor roller by an angle
of approximately 20° - 40° until it has arrived in a first end
position. Thereby, powder on the first paddle 60 is lifted at
the side of the blade 56 facing the construction field ( con-
struction field side) . When the application device is in the
first end position, a good portion of the powder on the paddle
60 (seen in a direction perpendicular to the work plane) is
above the level that is defined by the lower end of the blade.
Simultaneously to the rotation of the conveyor roller the hook-
shaped portion 62a' at the one end of the con-rod 62' is lifted
with respect to the work plane 55. Thus, the device is prepared

8
for the application of a next powder layer by moving the appli-
cation device in a direction away from the conveyor roller to
the second end position at the other side of the construction
field.
After the application of the layer 71 of the material in powder
form the solidification at positions in this layer correspond-
ing to the cross-section of the object is effected by
exposition to the laser in a manner known as such.
Thereby, it is in particular decisive for the quality of the
finished object that the temperature of the top-most powder
layer to be solidified has a temperature within a certain
range, the process window. Above this process window the powder
is already sintered without additional irradiation energy,
whereas at temperatures below the process window warping occurs
in the solidified layer. In many cases also the so-called curl
effect, where the edges of the solidified layer bend up or roll
up, is ascribed to a temperature of the top-most powder layer
that is too low. Therefore, in order to achieve good results,
in particular in order to avoid a warping in the manufactured
object, the powder layer applied with the application device
before the solidification has to be heated with the heating de-
vice 12 to a working temperature TA within the process window.
To this effect after the application of the powder layer the
temperature of this layer is measured by the temperature meas-
uring device 13. Depending on the temperature measured in this
process the heating power of the heating device 12 is deter-
mined. After the top-most powder layer has been heated up to
the working temperature TA, the positions in the layer of the
building material corresponding to the cross-section of the ob-
ject are solidified by irradiation with the laser.

9
After the solidification of a layer the support 2 is lowered by
a distance corresponding to the layer thickness and a new pow-
der layer 73 is applied with the application device onto the
layer 71 that has been previously exposed to the laser.
In an operating stage that is shown in Fig. 4 the application
device 52 moves away from the conveyor roller 53 in a direc-
tion, which is parallel to the work plane 55, in order to cre-
ate the next powder layer 73. In the process the second actua-
tion element 58 finally pushes the lifted hook-shaped portion
62a' of the con-rod 62' . Thereby, the con-rod 62' is taken
along in the direction of movement of the application device 52
and the conveyor roller 53 is further rotated. In this process
the conveyor roller is rotated by an angle of approximately
140° - 160°. The excess powder that is still on the paddle 60
is conveyed to the feeding area below the feeding chute 54. At
the same time powder from the feeding area is transported by
the second paddle 60' from the feeding area in a direction to-
wards the construction field. The powder in the feeding area
consumed in this process thereby re-trickles from the feeding
chute. When the feeding area is filled up with powder, the re-
trickling, i. e. the feeding of powder from the feeding chute,
stops by itself. At this stage, with the movement of the con-
rod 62' the hook-shaped portion 62a' again drops towards the
work plane 55 until the second actuation element no longer
bears against it and the con-rod 62' is no longer taken along
by the application device 52.
In Fig. 5 the device is illustrated at the operating stage, in
which the application device 52 is positioned on the other side
of the construction field, which is not illustrated in Figs. 2
to 5. The application device is moved in a direction away from

10
the conveyor roller 53 until within the whole construction
field a layer 73 of the powder material has been applied by the
application device. At this stage the conveyor roller 53 is ro-
tated by 180° with respect to the position that is illustrated
in Fig. 2.
With the help of Figs. 2 to 5 the operation of the material
transport device and the material supply device on a first side
of the construction field has been described. At the other,
second, side, which is opposed to the first side of the con-
struction field, a similar device is provided, which consists
of a conveyor roller, a trough, a feeding device and con-rods
and works in the same way as it was described by Figs. 2 to 5
above. In order to create the next layer, the application de-
vice 52 is again moved in a direction towards the conveyor
roller 53, as shown in Fig. 2.
Then, the previously described steps are repeated until the
manufacturing of the three-dimensional object is finished.
In Fig. 6 a device 100 for applying layers of a powder material
according to a second embodiment is shown.
The device for a repeated creation of a powder layer according
to a second embodiment comprises an application device 101, a
material transport device formed as fluidization device 102 and
a feeding device 104 provided with a cover 103.
The application device 101 is movable back and forth above a
work plane 107 between two end positions by means of a drive
indicated by an arrow B in the same way as in the first embodi-
ment. It comprises a blade 105 and an actuation element 106.

11
The fluidization device includes a chamber 108 for pre-heating
the nitrogen that is used for the fluidization, a fluidization
sheet 109, by which the chamber 108 is closed at the top, and a
pipe 111 for supplying nitrogen into the chamber 108, which is
provided with a valve 112. The chamber 108 is provided with a
heating device 117 (e.g. a resistive heating with temperature
control) for pre-heating the nitrogen. The fluidization sheet
109 is provided with a plurality of small openings 110 that
have a smaller diameter D than the powder grains that are used.
A gas supply 111 leads into the chamber 108, wherein the supply
of gas into the chamber can be controlled via a valve 112.
A material feeding device 104 having a cover 103 is formed
above the fluidization sheet. The cover 103 is formed and posi-
tioned in such a way that when moving the application device to
its end position by the actuation element 106, it is pushed
aside and thereby the material feeding device having an opening
116 is opened towards a feeding region located below the mate-
rial feeding device. To this effect, the actuation element 106
is formed in such a way that during the opening of the cover
the actuation element 106 itself does not get into the opening
region of the material feeding device. In particular, during
the opening the actuation element pushes the cover 103 behind
or in front of the opening 116 of the container 104 when seen
from a direction, which is perpendicular to the drawing plane
of Fig. 6. The cover is laterally attached to a side wall by a
spring 113, which presses the cover into the closed position
when the actuation element 106 does not push against the cover
103.
On the other side of the construction field a further second
material feeding device and a further second fluidization de-

12
vice are provided mirror-symmetrically to the above-mentioned
material feeding device and fluidization device.
During operation at first a first powder layer 115 is applied
onto the work plane 107 by moving the application device across
the construction field parallel to the work plane 107 in a di-
rection towards the material feeding device. Thereby, excess
powder is shoved out of the construction field to the outside
onto the fluidization sheet 109. The application device is fur-
ther moved to its end position and by a pushing of the actua-
tion element 106 against the cover 103 thereby opens the mate-
rial feeding device 104, from which powder re-trickles into the
feeding region below the material feeding device until this is
filled up and the re-trickling stops by itself. Subsequently
the application device is moved just as far from the end posi-
tion as is sufficient for closing again the material feeding
device via the spring 113 and the cover 103.
By opening the valve 112 for a short time and letting nitrogen
into the chamber 108 via the supply pipe 111, a pressure im-
pulse is created in this chamber, which leads to a discharge of
pre-heated nitrogen out of the openings 110 into the powder
above the fluidization sheet 109. Thereby this powder is fluid-
ized and flows through the gap between the blade and the flu-
idization sheet from the feeding region at the one side of the
blade 105 to the other side of the blade that faces the con-
struction field. Thereby, the application device is prepared
for the application of a next powder layer.
As in the first embodiment, the powder layer is pre-heated by
the heating device 12 in a manner known as such and is solidi-
fied at the positions corresponding to the cross-section of an
obj ect.

13
In the next step after the lowering of the support 2 as in the
first embodiment the application of a next powder layer onto
the work plane within the construction field takes place by
moving the application device from the first end position to
the second end position at the other side of the construction
field.
The operation of the second feeding device and the second mate-
rial transport device is like the above-described operation of
the devices shown in Fig. 6.
Then, the previously described steps are repeated until the
manufacturing of the three-dimensional object is finished.
Alternatives and variations of the above-described devices and
the above-described methods are possible.
The device according to the second embodiment has been de-
scribed having a fluidization device, wherein the fluidization
is achieved by introducing pre-heated nitrogen. However, the
fluidization can also be effected by introducing another gas. A
further possibility of achieving the fluidization is to set the
powder into vibrations.
The device according to the first and the second embodiment has
been described such that on both sides of the construction
field the same material transport devices and material feeding
devices are provided. However, it is possible to combine the
devices according to the first and the second embodiments such
that on the one side of the construction field a material
transport device and a material feeding device according to the
first embodiment are provided, whereas on the other side a ma-

14
terial transport device and a material feeding device according
to the second embodiment are provided.
It is also possible, like in the first and second embodiments,
to provide on both sides of the construction field a material
transport device according to the invention, however, to pro-
vide a material feeding device only on one side of the con-
struction field. Accordingly, during operation the material
transport device on that side, at which the material feeding
device is located, has to provide an amount of material that is
sufficient for two layers. This modification allows a simpler
and more compact design of the device.
The invention has been described by means of a laser sintering
device, in which a laser is used as radiation source. Any other
radiation source by which electromagnetic or particle radiation
may be introduced into the building material, is possible.
Thus, e. g. a radiation source for incoherent light radiation,
for IR radiation, for X-ray radiation or for electron radiation
may be used as radiation source. Accordingly, a building mate-
rial has to be used, which can be solidified by the correspond-
ing radiation.
Alternatively, the device for applying powder layers according
to the invention may also be used in 3D printers, in which the
powder layers are solidified by selectively applying a binder
or adhesive at the cross-section of the object to be manufac-
tured.
In the above-described device an infrared radiator above the
work plane is described as heating device. Other possibilities
of heating a previously applied layer of the building material
are conceivable. For example, the circulation of warm air or

15
nitrogen that is led across the recently applied layer can be
used for a pre-heating of the layer.
The embodiment of a device for manufacturing a three-
dimensional object has been provided with a heating device for
pre-heating an applied, but not yet sintered, powder layer to a
work temperature TA that is suitable for the solidification and
sintering, respectively, as well as with a temperature measur-
ing device that serves for measuring the temperature of the
previously applied and top-most powder layer, respectively. De-
pending on the material that is used and the process control a
pre-heating of the applied material layer can be abandoned in
the device for manufacturing of a three-dimensional object ac-
cording to the invention. Accordingly, the device for manufac-
turing a three-dimensional object may also be constructed with-
out a heating device and without a temperature measuring de-
vice.
The second embodiment has been described such that the fluidi-
zation is accomplished by means of a pre-heated gas. However,
it is also possible to implement the fluidization by a gas that
was not pre-heated. Accordingly, the fluidization device need
not necessarily include a heating device for pre-heating the
gas used for fluidization.

16
CLAIMS
1. Device for applying layers of a powder material ( 71,
73; 115) comprising an application device ( 8; 52; 101), which
can be moved back and forth between two end positions in order
to apply a layer of material ( 71, 73; 115) and which comprises
a blade ( 56; 105) for removing excess material ( 72) when gener-
ating a layer of material ( 71, 73; 115), characterized by
a material transport device ( 11; 53; 102), by which mate-
rial can be transferred from one side of the blade ( 56; 105) to
the other side of the blade.
2. Device according to claim 1, further comprising a ma-
terial feeding device ( 9, 10; 54; 104) that comprises a supply
container ( 10) for the material and is formed such that the
supply of material to a feeding region is automatically inter-
rupted, when there is a predetermined amount of material in the
feeding region.
3. Device according to claims 1 or 2, wherein the mate-
rial transport device ( 11) comprises a conveyor roller (53),
which is rotatable around an axis (59), for the transfer of
material from the one side to the other side of the blade (56).
4. Device according to claim 3, wherein a mechanics (61,
62, 62' , 63, 63' , 64) is provided, by which the movement ( B) of
the application device ( 52) is coupled to the rotation of the
conveyor roller ( 53) such that by a singular back and forth
movement of the application device ( 52) material is transported
from one side of the blade ( 56) to the other side of the blade
( 56) by means of the conveyor roller (53).

17
5. Device according to claim 3 or 4, wherein the con-
veyor roller ( 53) comprises two paddles ( 60, 60' ) that are mir-
ror-symmetrical to the axis of rotation of the conveyor roller
(53).
6. Device according to one of claims 3 to 5, wherein the
conveyor roller ( 53) is a roller having at least one chamber
that is formed such that it is a recess, by which through a ro-
tation of the .roller material is transported from one side of
the blade to the other side of the blade by means of the cham-
ber.
7. Device according to one of claims 3 to 6, wherein a
trough ( 65) is provided that is adapted to the shape of the
conveyor roller and accommodates a part of the conveyor roller.
8. Device according to claim 7, wherein the trough ( 65)
comprises a heating for pre-heating the material in the trough
(65).
9. Device according to claim 1 or 2, wherein the trans-
port device (11) is a fluidization device (102), by which gas
can be blown into the material such that the material fluidizes
and flows from one side of the blade ( 105) to the other side of
the blade ( 105) , when the application device ( 101) is in a pre-
determined position.
10. Device according to claim 1 or 2, wherein the trans-
port device ( 11) is a fluidization device, by which the mate-
rial is vibrated such that the material fluidizes and flows
from one side of the blade to the other side of the blade, when
the application device is in a predetermined position.

18
11. Device according to one of claims 1 to 10, wherein at
each of the two sides of the construction field that correspond
to the two end positions of the application device, a transport
device ( 11; 53; 102) is provided.
12. Method for applying layers of a powder material ( 71,
73; 115) by means of an application device ( 52; 101) that can
be moved between two end positions in order to apply a layer of
material and that comprises a blade ( 56; 105), having the
steps:
(a) applying a layer of material onto a surface by
means of the application device ( 52; 101), wherein in the
process the blade removes the excess material ( 72) and
shoves it out of the construction field (55), character-
ized in that the method comprises the following step:
( b) transferring material from a side of the blade
that is facing away from the construction field to the
other side of the blade of the application device that is
facing the construction field.
13. Method according to claim 12, wherein material from a
supply container ( 10) is fed to a feeding area at the side of
the construction field ( 55; 107) via a material feeding device
( 54, 104) .
14. Method according to claim 13, wherein in step ( b) the
material is transferred from the feeding area at the side that
is facing away from the construction field ( 55; 107) to the
other side of the blade of the application device ( 52; 101)
that is in an end position or near an end position, which is
facing the work area.

19
15. Method according to claim 13 or 14, wherein in the
step ( a) the excess material ( 72) is shoved into the feeding
area by the blade ( 56; 105) .
16. Method according to one of claims 13 to 15, wherein
the feeding of material into the feeding area is stopped when
there is a predetermined amount of material in the feeding
area.
17. Method according to one of claims 12 to 16, wherein
in step ( b) the transfer of material is effected by a rotatable
conveyor roller (53).
18. Method according to one of claims 12 to 16, wherein
in step ( b) the transfer of material is effected by fluidizing
the material by means of a fluidization device (102).
19. Device for manufacturing a three-dimensional object
by solidifying layers of a material at positions corresponding
to the respective cross-section of the object by means of a de-
vice for applying layers of a powder material according to one
of claims 1 to 11.

A device ( 51) for applying layers or a powder material ( 71) by
means of an application device ( 52) is described, wherein the
application device ( 52) can be moved back and forth between two
end positions in order to apply a layer of material (71) and
the application device ( 52) comprises a blade (56) for removing
excess material during the application of a layer of material
(71). The device (51) is characterized by a material transport
device (53), by which the material can be transferred from one
side of the blade ( 56) to the other side of the blade. The device
has the particular advantage that layers of material (71)
can be applied without any loss of material and is particularly
applicable in a laser sintering device.


Documents:

03085-kolnp-2007-abstract.pdf

03085-kolnp-2007-claims.pdf

03085-kolnp-2007-correspondence others.pdf

03085-kolnp-2007-description complete.pdf

03085-kolnp-2007-drawings.pdf

03085-kolnp-2007-form 1.pdf

03085-kolnp-2007-form 3.pdf

03085-kolnp-2007-form 5.pdf

03085-kolnp-2007-gpa.pdf

03085-kolnp-2007-international publication.pdf

03085-kolnp-2007-international search report.pdf

03085-kolnp-2007-others.pdf

03085-kolnp-2007-priority document.pdf

3085-KOLNP-2007-ABSTRACT 1.1.pdf

3085-KOLNP-2007-AMANDED CLAIMS.pdf

3085-KOLNP-2007-CORRESPONDENCE 1.1.pdf

3085-KOLNP-2007-CORRESPONDENCE OTHERS 1.1.pdf

3085-KOLNP-2007-CORRESPONDENCE OTHERS 1.2.pdf

3085-KOLNP-2007-CORRESPONDENCE-1.2.pdf

3085-KOLNP-2007-DESCRIPTION (COMPLETE) 1.1.pdf

3085-KOLNP-2007-DRAWINGS 1.1.pdf

3085-KOLNP-2007-FORM 1 1.1.pdf

3085-KOLNP-2007-FORM 18.pdf

3085-KOLNP-2007-FORM 2.pdf

3085-KOLNP-2007-FORM 3 1.1.pdf

3085-KOLNP-2007-FORM 3-1.1.pdf

3085-KOLNP-2007-FORM 3.pdf

3085-KOLNP-2007-FORM-27.pdf

3085-KOLNP-2007-OTHERS 1.1.pdf

3085-KOLNP-2007-PETITION UNDER RULE 137.pdf

3085-KOLNP-2007-REPLY TO EXAMINATION REPORT.pdf

abstract-03085-kolnp-2007.jpg


Patent Number 247786
Indian Patent Application Number 3085/KOLNP/2007
PG Journal Number 20/2011
Publication Date 20-May-2011
Grant Date 18-May-2011
Date of Filing 22-Aug-2007
Name of Patentee EOS GMBH ELECTRO OPTICAL SYSTEMS
Applicant Address ROBERT-STIRLING-RING 1 KRAILLING
Inventors:
# Inventor's Name Inventor's Address
1 PERRET HANS KRUMPTERSTR. 6, 81543 MUNCHEN
2 PHILIPPI JOCHEN HERRSCHINGER STR. 10, 81377 MUNCHEN
3 KELLER PETER BUCHENSTR. 24, 82152 KRAILLING
4 CANTZLER GERD MICHLBAUERSTR. 9, 82061 NEURIED
5 GOTH MICHAEL PERLACHER STR. 13, 81539 MUNCHEN
6 HALDER, THOMAS WURZSTR. 1, 81371 MUNCHEN
PCT International Classification Number B22F 3/00,B29C 67/00
PCT International Application Number PCT/EP2006/002572
PCT International Filing date 2006-03-21
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 10 2005 016 940.6 2005-04-12 Germany