Title of Invention

DEVICE AND METHOD FOR CONTROLLING A THICK MATTER PUMP

Abstract The invention relates to a device and a method for controlling a two-cylinder thick matter pump comprising delivery pistons that are actuated in a push-pull manner by means of a hydraulic reversible pump (6) and hydraulic drive cylinders controlled by said pump. For each pressure stroke, the delivery cylinders (50, 50") are connected to a delivery conduit (58) by means of a pipe junction (56) , At the end of a pressure stroke, a reversal process of the reversible pump (6) and the pipe junction (56) is triggered. The aim of the invention is to obtain a targeted reversal of the reversal pump and the pipe junction, even when the deliverable quantity is varied, whereby the delivery cylinders are completely emptied, but also without pistons banging the ends of the cylinders. To this end, a computer-assisted reversal device is provided, said device comprising a measuring and evaluating routine for detecting the temporal displacement course of the piston along the path thereof between the two cylinder ends, by measurement and/or calculation, and for calculating a triggering time derived therefrom for the subsequent reversal of the reversible pump and the pipe switch.
Full Text DEVICE AND METHOD FOR CONTROLLING A THICK MATTER PUMP
The invention concerns a device and a process for controlling a
thick matter pump with two conveyor cylinders communicating via
end openings in a material supply container operable in counter
stroke by means of a hydraulic reversible pump and via these
control hydraulic drive cylinders, with a hydraulic operated
pipe switch provided within the material supply container, of
which the inlet side is alternatingly connectible to one of the
openings of the conveyor cylinders leaving open the respective
other opening and on the outlet side connected with a conveyor
conduit, wherein the passing-by of the piston is detected at
each conveyor stroke in at least two sensor positions in
predetermined spacing from each other and from the rod and/or
bottom side end of the drive cylinder, and upon ending of the
conveyor stroke, a switching or reversing process of the
reversible pump and the pipe switch is initiated.
A device for control of a two cylinder thick matter pump of this
type is known (DE 195 42 258), in which the end position of the
piston of the drive cylinder can be determined by means of
cylinder switch sensors or proximity sensors for producing end
position signals. Here, the flow-through reversal of the
reversible pumps is initiated by the end-position signal of the
drive cylinder. As a rule, the end-position signal is
conventionally triggered via the two cylinder switch sensors at
the rod end of the cylinder. In the switching of the reversible
pump and the pipe switch there always occur problems when the
amounts to be conveyed are varied, for example, via a remote
control. Therein it is to be taken into consideration, that the
switching of the reversible pump does not occur instantaneously.
It requires rather a certain reversal time for the carrying out
-1 -

of the movement of the slant disk present in the reversible
pump. The switching-over times, in the conventional reversible
pumps, lie at approximately 0.1 second. In a two second stroke
this reversal interval represents approximately 5% of the stroke
length. Further compounding this is additional delay times, for
example for the switching of relays, which could lie in the same
order of magnitude. This means, that for the switching of the
reversible pumps, depending upon piston speed, distances can be
achieved which could lead either to a banging of the piston at
the base or lead to an incomplete emptying of the cylinder. For
this reason there have already been provided cylinder switch
sensors for signal production of the piston passage in the area
of the end positions spaced apart from the rod or base side end
of the cylinder. If the piston passes also through this sensor
position, then there still remains available a certain amount of
piston travel distance for switching over. With known two
cylinder thick matter pumps the position of the cylinder switch
sensors was so selected that at maximal possible piston speed a
switching of the reversible pump, which just leads to a contact
of the piston with the base, is made possible. If the piston
travels slower than this maximum, then on the basis of the
constant switch time of the reversible pump and the reaction
time of the relays, this leads thereto, that the piston during
this time does not run all the way to the adjacent base. Thus a
residual amount of concrete remains in the cylinder, which
during a piston stroke is not extruded out of the cylinder.
This can lead to a hardening of the concrete and to an
obstruction. In the case of single circuit pumps the one and
the same hydraulic pump also switches over the pipe switch.
This must occur at precisely the time at which the piston
reaches the base side or the rod side end. Only then is the
pump pressure sufficient for the switching over of the pipe
-2-

switch. A particular problem of the single circuit pump is thus
comprised therein, that the time point of the switching of the
reversible pump, the stopping of the piston and the switching of
the pipe switch must be coordinated precisely to each other. In
two circuit pumps, in which the pipe switch is switched over via
a pressure accumulator, the coordination problems may be
somewhat reduced. Similarly however herein there is also need
for a suitable coordination to ensure that the piston so
completely traverses the cylinder in order to avoid undesired
residual amounts of concrete in the cylinders.
Beginning therewith, it is the task of the present invention to
develop a device and a process for controlling a thick matter
pump of the above described type, whereby a complete emptying of
the cylinder at each piston stroke is made possible, and
nevertheless an undesired banging of the piston at the end of
the drive cylinder is avoided.
For the solution of this task the combination of characteristics
set forth in Claims 1 and 6 is proposed. Advantageous
embodiments and further developments of the invention can be
seen from the dependent claims.
The inventive solution is based upon the idea that, with at
least two cylinder switch sensors provided on any position in
the drive cylinder, which are provided spaced apart from each
other and from the two ends, a detection of movement of the
drive piston is made possible, which, with the assistance of a
computer assisted switching device with suitable software,
enables a complete detection of the course of movement of the
piston along the work cylinder and therewith the solution of the
above indicated problems. In order to accomplish this, it is
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primarily proposed in accordance with the invention, that the
computer assisted switching device includes a measurement and
evaluation routine for measurement-technical and/or computer
assisted detection of the time/movement course of the piston on
its way between the two cylinder ends, as well as for computing
a therefrom derived time point for initiation of the switching
of the reversible pump and the pipe switch.
One preferred embodiment of the invention envisions that the
measurement and evaluation routine includes an algorithm for
detecting the time of the piston passage at the location of the
cylinder switch sensor as well as for calculating a therefrom
derived initiation or trigger time point for a switching of the
reversible pump and the pipe switch at each piston stroke, with
taking into consideration of a predetermined or computed
interval time of the piston until the respective impact at the
cylinder end. The interval time of the piston is essentially
comprised of the reaction time of the switch relay and the
switching-over time of the reversible pump.
With constant operating mode, without changing the conveyed
amounts, there can be computed or assigned at each time
interval, which is measured as reference value for the speed, a
initiation point for the switching over of the reversible pump
and the pipe switch. The detection of time can in this case
occur for.example via a switch impulse for the pipe switch. The
distance between two switches of the pipe switch correspond then
to the measured stroke duration. With taking into consideration
the measured stroke duration then, during passage of the piston
through one of the two cylinder switch sensors, the initiation
time point for the switching can be determined. This value is
approximately constant for one and the same type of pump design.
-4-

A special circumstance occurs when the conveyed amount within
the pipe stroke is to be changed. In this case a new conveyance
mount must be taken into consideration and a corresponding
residual run-time must be calculated in order to determine the
precise initiation point.
A preferred design of the invention accordingly provides that
the measurement and evaluation routine includes an algorithm for
calculating the speed of the piston on its path between the
cylinder switch sensors and a therefrom derived initiation point
for the switching process, with taking into consideration of a
predetermined or computed brake or dwell time of the piston
until the respective end-impacting in the cylinders.
A preferred embodiment of the invention envisions that the
measurement and evaluation routine consults preset values for
the conveyor amounts of the reversible pump input in a
preferably remote control device and an algorithm for
determining the piston speed plot and the therefrom derived next
initiation point in time for the switching process according to
the magnitude of the currently set target value. Therein it is
of particular value, when the measurement and evaluation routine
includes an algorithm for determining the interval time or the
travel path of the piston according to the magnitude of the
instantaneous measured or calculated piston speed and a
therefrom derived initiation time point for the switch process.
In accordance with the inventive process, it is primarily
decided that the time movement sequence of the piston is
measured and/or computed while on its path between the two
cylinder ends and therefrom the respective next initiation or
actuation point in time for the switching process is derived. A
-5-

preferred embodiment of the invention envisions that the passage
or transition of the pistons at the location of the cylinder
switch sensors is detected in time-relation to each other, and
that therefrom the initiation point in time for the respective
following switching of the reversible pump and the pipe switch
is computed, taking into consideration a predetermined or
computed brake time of the piston until the respective end
banging of the cylinder. Therein the speed of the piston on its
way between the selected cylinder switch sensors can be computed
and therefrom the next point in time for the switching process
can be derived.
A further preferred mode of the inventive process is comprised
therein, that the movement of the piston over time is changed
via remote control demand values for the conveyed mounts, and
that from the, according to the value or magnitude of the demand
value calculated movement sequence of the piston, with taking
into consideration of a thereby modified brake time/ the next
initiation or actuation point for the switching process is
derived. For this it can be useful, that brake time or the
interval path of the piston is determined from the measured or
the computed instantaneous piston speed with respective taking
into consideration of the device-specific response and switch
times for the reversible pump, and therefrom calculates the
respective next initiation point in time.
In the following the invention will be described in greater
detail on the basis of illustrative embodiments shown in greater
detail in schematic manner in the figures. There is shown
Fig. 1 A section of a two cylinder thick matter pump in
partial sectional perspective representation;
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Fig. 2 A circuit diagram of a computer-controlled drive
hydraulic for the two cylinder thick matter pump;
Fig. 3 A section from Fig. 2 with a few indications of value
for the computation of a preferred initiation time
point;
Fig. 4 A speed-/time-diagram of the piston movement along the
drive cylinders;
Fig. 5 A flow diagram of the measurement and initiation
routine.
The control arrangement shown in Fig. 2 and 3 is intended for
the thick matter pump corresponding to Fig. 1. The thick matter
pump includes two conveyor cylinders 50, 50', of which the end
openings 52 communicate in a material supply container 54 and
alternatingly can be connected during the pressure stroke with a
conveyor conduit 58 via a pipe switch 56. The conveyor
cylinders 50, 50' are operated in counter stroke via hydraulic
drive cylinders 5, 5' and a reversible hydraulic pump 6. For
this purpose the conveyor pistons 60, 60' of the conveyor
cylinder 50, 50' are each connected with a piston 8, 8' of the
drive cylinder 5, 5' via a common piston rod 9, 9'.
In the illustrative embodiment the drive cylinders 5, 5' are
acted upon with hydraulic pressure on the base side via
hydraulic lines 11, 11' of the hydraulic circulation assisted by
the reversible pump 6 and are, on their rod side end, connected
hydraulically with each other via an oscillating oil conduit 12.
The direction of movement of the drive pistons 8, 8' and
-1-

therewith the common piston rods 9, 9' are reversed due to the
flow-through direction of the reversible pump 6 being reversed
via a reversing device 18 containing a computer 14 and a switch
mechanism 16. The reversible pump 6 has for this purpose a
slant disk 62, which for reversing is pivoted through its zero
position, so that the conveyor device reverses the oil pressure
in the hydraulic conduits 11, 11' . The conveyed amount of the
reversible pump 6 can be varied, while keeping constant a
predetermined rotational speed of a not shown drive motor, by
changing the pivot angle of the slant disk 62. The pivot angle
of the slant disk 62 can therein be adjusted via a remote
control device 64 with the support of a computer 14.
The reversing of the reversible pump and the pipe switch 56
occurs as soon as the piston 8, 8' of the drive cylinders 5, 5'
reach their end position. The reversing device evaluates output
signals of the respective cylinder sensors 20, 22 and 20', 22' ,
provided respectively a distance from the rod side and base side
ends of the two drive cylinders 5', 5', which on the output side
are connected with the computer 14 of the control device 18.
The cylinder switch sensors react to the drive pistons 8, 8'
running thereby during operation of the pump, and signal this
occurrence to the computer input 66, 68. Upon occurrence of the
output signals a reverse signal 76 is initiated time-delayed in
the reversing device, which reverses the reversible pump 6 via
the adjusting mechanism 16. In the sequence of the reversal
process there is initiated in addition, via a signal 77, a
reversal of the pipe switch 56 via the direction control valve
79 and the plunger cylinder 72, 72' . In normal operation it is
primarily the signals of the rod side cylinder switch sensors
20, 20' that are employed for producing a reverse signal. For
this, the computer 14 includes a measurement and evaluation
-8-

routine 40 (See Fig. , 5) , in which the initiation signal of the
rod side cylinder switch sensors 20, 20' are evaluated with
formation of a reverse signal 76, 77 for the reversible pump 6
and/or the pipe switch 56.
In the following there will be described in greater detail on
the basis of Fig. 3 and 4 a method of calculating which forms
the basis of the measurement and evaluation routine 40.
In Fig. 3 the rod side cylinder switch sensors 20, 20' are
referenced with S1 and S2. In accordance therewith the sensor
positions from the base side end of the drive cylinder are
indicated with XS1 and Xs2, while the useful length of the
cylinder, which is computed from the cylinder length minus
piston length, is referenced with XZy1. Herein this is concerned
with the maximal piston stroke. The position XS1, Xs2 of the
cylinder switch sensors and the useful X2yl are known.
-9-
The object of the invention is the calculation of a position of
Xx or, as the case may be, the associated time tx for the piston
passage through at location Xx, from which point the reversible
pump must be reversed, so that a complete piston stroke without
hard banging at the cylinder base can be achieved. This
position is dependent upon the conveyed amount, however is
independent of the position of the cylinder switch sensors (See
Fig. 4). The speed VK of the piston is produced from the useful
length XZyl and the stroke time tHub as well as the acceleration
and brake paths and times XBeSchi, XBremS, tBeschi, tBrems as:


The brake (deceleration) or initiation point for reversal
follows as:
Wherein for simplification a presumption is made of a constant
brake acceleration bbrems:



A more precise determination of the initiation point is
possible, as supplemental information of the piston passage
through the switch position S1 or as the case may be S2 is
undertaken. Thus there is computed for example the time between
the stroke start and the switch 1 as:

For the initiation or start time starting with switch 1 there
results the value
Atxi = tx - txsi
Similar applies for the position xS2 of the cylinder switch
sensor S2:
Atx2 = tx ~ txS2
-10-

In the case of the switch S1 or as the case may be S2 is passed
by prior to the initiation point in time, then the time Δtxl or
as the case may be Δtx2 will begin after the passage by the
cylinder switch sensor. If the cylinder switch sensors lie
behind the initiation position, then the initiation time is
computed beginning with the beginning of the stroke.
Analogously to the above described methods of computation the
initiation point can also be determined in the case of a change
in the conveyed amount. For this the useful length XZyl is to be
divided (stroke shortened) depending upon the change in the
conveyed amount, and the new speed VK of the piston (in the short
stroke) be determined for the calculation of the time to brake.
This is a known value, based on the required amount to be
conveyed.
The flow diagram of the measurement and evaluation routine 40 in
Fig. 5 illustrates the measurement and control processes during
the piston movement in the work cylinders. At the positions S1
and S2 of the cylinder switch sensors the time point tS1 and ts2
of the passing by pistons is determined and therefrom the
theoretical stroke time tHub is computed or calculated. In the
case that the conveyor amount is changed in between, this has an
impact upon the stroke time tHub and therewith also upon the
piston speed. These values are then taken into consideration in
the computation of the initiation time, which finally leads at
the point in time tx or as the case may be Atx to initiation of
the reverse movement in the pipe switch and the reversible pump.
In order to ensure a safe and reliable concrete conveyance also
in the case of a loss of one or the other cylinder switch
-11 -

sensors S,S2, there is parallel to the event measurements at the
cylinder switch sensors, a hold back time is input for the
stroke time, which independently of the measurement process at
the cylinder switch sensors can initiate, via a parallel branch,
the reversing of the pipe switch and the reversible pump.
In summary the following can be concluded: The invention
relates to a device and a method for controlling a two-cylinder
thick matter pump comprising delivery pistons that are actuated
in a push-pull manner by means of a hydraulic reversible pump 6
and hydraulic drive cylinders controlled by said pump. For each
pressure stroke, the delivery cylinders 50, 50' are connected to
a delivery conduit 58 by means of a pipe switch 56. At the end
of a pressure stroke, a reversal process of the reversible pump
6 and the pipe switch 56 is triggered. The aim of the invention
is to obtain a targeted reversal of the reversal pump and the
pipe junction, even when the deliverable quantity is varied,
whereby the delivery cylinders are completely emptied without
pistons slamming or bottoming out in the drive cylinders. To
this end, a computer-assisted reversal device is provided, said
device comprising a measuring and evaluating routine for
detecting the temporal displacement course of the piston along
the path thereof between the two cylinder ends, by measurement
and/or calculation, and for calculating a triggering time
derived therefrom for the subsequent reversal of the reversible
pump and the pipe switch.
-12-

Patent Claims
1. Device for controlling a thick matter pump with two
conveyor cylinders {50, 50'} communicating via two end
openings (52) in a material supply container (54), operated
in counter stroke by a hydraulic reversible pump (6) via
hydraulic drive cylinders (5, 5') control by the reversible
pump, with a hydraulically actuated pipe switch (56)
provided within the material supply container (54), which
pipe switch is on its inlet side alternatingly connectable
to one of the openings (52) of the conveyor cylinders (50,
50'} freeing the respective other opening and on the outlet
side is connected with a conveyor conduit (58), wherein the
drive cylinders (5, 5' ) are hydraulically connected at one
end via respectively one hydraulic conduit {11, 11' ) to a
connector of the reversible pump (6) and on their other end
are hydraulically connected with each other via an
oscillating oil conduit (12), with at least two cylinder
switch sensors (20, 20'; 22, 22'} in predetermined
separation from each other and spaced from the rod ends
and/or base ends of the drive cylinders (5, 5') and
sensitive to the passage by of a piston {8, 8') of the
drive cylinder, and with a device (18) responsive to the
output signal of selected cylinder switch sensor for
switching or reversing the reversible pump (5) and the pipe
switch (56) after completion of a piston stroke, thereby
characterized, that the device is a computer assisted
reversing device including a measurement and evaluation
routine for determining, by measurement or computation, the
temporal displacement of the piston on its way between the
two cylinder ends, as well as for computing therefrom a
-13-

derived initiation time for the subsequent reversing of the
reversible pump and the pipe switch.
2. Device according to Claim 1, thereby characterized, that
the measurement and evaluation routine includes an
algorithm for determining the time of the piston passage at
the location of the cylinder switch sensors as well as for
computing a therefrom derived initiation time point for a
reversing of the reversible pump and the pipe switch at
each piston stroke, taking into consideration a
predetermined or computed brake time of the piston prior to
a respective impact at the end of the cylinder.
3. Device according to Claim 1 or 2, thereby characterized,
that the measurement and evaluation routine includes an
algorithm for computing the speed of the piston on its way
between the cylinder switch sensors and a therefrom derived
initiation point for the next reversing process, taking
into consideration a predetermined or computed brake time
of the piston prior to the respective impact at. the end of
the cylinder.
4. Device according to one of Claims 1 through 3, thereby
characterized, that the measurement and evaluation routine
responds to a, preferably input via a remote control,
target value for the conveyed amount of the reversible pump
and includes an algorithm for determining the
characteristic of the piston speed and the therefrom
derived initiation point for the next reversal process
according to the measure of the current set target value.
-14-

Device according to one of Claims 1 through 4, thereby
characterized, that the measurement and evaluation routine
includes an algorithm for determining the brake time or the
brake path of the piston according to the magnitude of the
instantaneously measured or computed piston speed and the
therefrom derived initiation point for the reversal
process.
Process for controlling a thick matter pump with two
conveyor cylinders (50, 50' ) communicating with two end
openings (52) in a material supply container (54), operated
in counter stroke via at least one hydraulic reversible
pump (6) and via hydraulic drive cylinders (5, 5' ) control
thereby, with a pipe switch provided within the material
supply container (54), on its inlet side alternatingly
connectable to the openings (52) of the conveyor cylinders
(50, 50' } freeing the respective other opening and on the
outlet side connected with a conveyor conduit (58), wherein
each conveyance stroke is monitored by at least two
cylinder switch sensors (20, 20'; 22, 22' ) at sensor
positions spaced with predetermined separation from each
other and from the rod and base side ends of the drive
cylinder (5, 5' } and initiating a reversing the reversible
pump (5) and the pipe switch (56), thereby characterized,
that the temporal displacement course of the piston on its
way between the two cylinder ends is measured and/or
computed and therefrom the initiation time point for the
respective next reversal process is derived.
Process according to Claim 6, thereby characterized, that
the passing of the pistons at the location of the cylinder
switch sensors are detected in time relation to each other
-15-

and that therefrom the initiation point for the respective
following reversal of the reversible pump and the pipe
switch is calculated, taking into consideration a
predetermined or computed brake time of the piston prior to
the respective impacting at the end of the cylinder.
Process according to Claim 6 or 7, thereby characterized,
that the speed of the piston on its way between the
selected cylinder switch sensors is calculated and that
therefrom the initiation point for the respective
subsequent reversal of the reversible pump and the pipe
switch is derived taking into consideration a predetermined
or computed brake time of the piston prior to the
respective impacting at the end of the cylinder.
Process according to one of Claims 6 through 8, thereby
characterized, that the movement of the piston over time is
changed via a remote control input target value for the
conveyed amount, and that from the computed movement
sequence of the piston according to the value of the input
target value, taking into consideration a thereby modified
brake time, the initiation point for the subsequent
reversal process is derived.
Process according to one of Claims 6 through 9, thereby
characterized, that the brake time or brake path of the
piston is determined based on the collective or computed
piston speed, respectively taking into consideration the
device specific reaction time and reverse time of the
reversible pump, and therefrom the respective next
initiation point is computed.


The invention relates to a device and a method for controlling a two-cylinder thick matter pump comprising delivery pistons that are actuated in a push-pull manner by means of a hydraulic reversible pump (6) and hydraulic drive cylinders controlled by said pump. For each pressure stroke, the delivery cylinders (50, 50") are connected to a delivery conduit (58) by means of a pipe junction (56) , At the end of a pressure stroke, a reversal process of the reversible pump (6) and the pipe junction (56) is triggered. The aim of the invention is to obtain a targeted reversal of the reversal pump and the pipe junction, even when the deliverable quantity is varied, whereby the delivery cylinders are completely emptied, but also without pistons banging the ends of the cylinders. To this end, a computer-assisted reversal device is provided, said device comprising a measuring and evaluating routine for detecting the temporal displacement course of the piston along the path thereof between the two cylinder ends, by measurement and/or calculation, and for calculating a triggering time derived therefrom for the subsequent reversal of the reversible pump and the pipe switch.

Documents:

02566-kolnp-2005-abstract.pdf

02566-kolnp-2005-claims.pdf

02566-kolnp-2005-description complete.pdf

02566-kolnp-2005-drawings.pdf

02566-kolnp-2005-form 1.pdf

02566-kolnp-2005-form 2.pdf

02566-kolnp-2005-form 3.pdf

02566-kolnp-2005-form 5.pdf

2566-KOLNP-2005-ABSTRACT 1.1.pdf

2566-KOLNP-2005-ABSTRACT 1.2.pdf

2566-KOLNP-2005-AMNDED PAGES OF SPECIFICATION.pdf

2566-KOLNP-2005-ASSIGNMENT.1.3.pdf

2566-KOLNP-2005-CLAIMS 1.1.pdf

2566-KOLNP-2005-CLAIMS 1.2.pdf

2566-KOLNP-2005-CORRESPONDENCE 1.2.pdf

2566-KOLNP-2005-CORRESPONDENCE-1.1.pdf

2566-KOLNP-2005-CORRESPONDENCE.1.3.pdf

2566-kolnp-2005-correspondence.pdf

2566-KOLNP-2005-DESCRIPTION (COMPLETE) 1.1.pdf

2566-KOLNP-2005-DESCRIPTION (COMPLETE) 1.2.pdf

2566-KOLNP-2005-DRAWINGS 1.1.pdf

2566-KOLNP-2005-DRAWINGS 1.2.pdf

2566-KOLNP-2005-EXAMINATION REPORT REPLY RECIEVED 1.1.pdf

2566-KOLNP-2005-EXAMINATION REPORT.1.3.pdf

2566-KOLNP-2005-FORM 1 1.1.pdf

2566-KOLNP-2005-FORM 1-1.2.pdf

2566-KOLNP-2005-FORM 1.1.3.pdf

2566-KOLNP-2005-FORM 13-1.1.pdf

2566-KOLNP-2005-FORM 13.1.3.pdf

2566-kolnp-2005-form 13.pdf

2566-KOLNP-2005-FORM 18.1.3.pdf

2566-kolnp-2005-form 18.pdf

2566-KOLNP-2005-FORM 2 1.1.pdf

2566-KOLNP-2005-FORM 2-1.2.pdf

2566-KOLNP-2005-FORM 26.1.3.pdf

2566-kolnp-2005-form 26.pdf

2566-KOLNP-2005-FORM 3 1.1.pdf

2566-KOLNP-2005-FORM 3.1.3.pdf

2566-KOLNP-2005-FORM 5.1.3.pdf

2566-KOLNP-2005-FORM 6.1.3.pdf

2566-KOLNP-2005-FORM 6.pdf

2566-kolnp-2005-gpa.pdf

2566-KOLNP-2005-GRANTED-ABSTRACT.pdf

2566-KOLNP-2005-GRANTED-CLAIMS.pdf

2566-KOLNP-2005-GRANTED-DESCRIPTION (COMPLETE).pdf

2566-KOLNP-2005-GRANTED-DRAWINGS.pdf

2566-KOLNP-2005-GRANTED-FORM 1.pdf

2566-KOLNP-2005-GRANTED-FORM 2.pdf

2566-KOLNP-2005-GRANTED-LETTER PATENT.pdf

2566-KOLNP-2005-GRANTED-SPECIFICATION.pdf

2566-kolnp-2005-international preliminary examination report.pdf

2566-kolnp-2005-international publication.pdf

2566-KOLNP-2005-INTERNATIONAL SEARCH REPORT 1.1.pdf

2566-kolnp-2005-international search report.pdf

2566-KOLNP-2005-OTHERS PCT FORM.pdf

2566-KOLNP-2005-OTHERS.1.3.pdf

2566-KOLNP-2005-OTHERS.pdf

2566-kolnp-2005-pct request form.pdf

2566-KOLNP-2005-PETITION UNDER RULE 137.pdf

2566-KOLNP-2005-REPLY TO EXAMINATION REPORT.1.3.pdf

2566-kolnp-2005-reply to examination report.pdf


Patent Number 248720
Indian Patent Application Number 2566/KOLNP/2005
PG Journal Number 32/2011
Publication Date 12-Aug-2011
Grant Date 10-Aug-2011
Date of Filing 12-Dec-2005
Name of Patentee PUTZMEISTER ENGINEERING GMBH
Applicant Address MAX-EYTH-STRASSE 10, D-72631 AICHTAL,GERMANY,
Inventors:
# Inventor's Name Inventor's Address
1 HOFLING, STEFAN HANDEL STRASSE 34, 63500 SELIGENSTADT, GERMANY
2 HOFMANN, WILHELM KIRCHGASSE 13, 61138 NIEDERDORFELDEN GERMANY
PCT International Classification Number F04B7/02; F04B9/00; F04B9/117
PCT International Application Number PCT/EP05/002893
PCT International Filing date 2005-03-18
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 102004015416.3 2004-03-26 Germany