Title of Invention

SPACER EXPANDER

Abstract The present invention provides a spacer expander of a combined oil ring having a narrow axial width, wherein the spacer expander is excellent in followability and stability and effective in reducing engine oil consumption. In a combined oil ring 20 having a spacer expander 50 to be installed between a pair of upper and lower side rails 30, 40, a plurality of axially protruding inner peripheral protruding portions 52, 53 are formed on the inner peripheral side of the spacer expander 50 along its peripheral direction. The inner peripheral protruding portions press the inner peripheral surface of the side rails. On the outer peripheral side of the spacer expander, a plurality of slits 54 are formed, and a plurality of connecting portions are located in the peripheral direction isolated by the slits. On the plurality of connecting portions, axially protruding outer peripheral protruding portions, 57, 58 are formed.
Full Text SPACER EXPANDER
FIELD OF THE INVENTION
This invention relates to a spacer expander of a three-piece type
combined oil ring that is installed in a piston of an internal combustion
engine and performs oil controlling.
BACKGROUND OF THE INVENTION
A cross sectional configuration of general piston rings installed in
a piston of an internal combustion engine is shown in Fig. 9. In a piston 100,
ring grooves 110, 120, and 130 are formed for accommodating piston rings.
In each ring groove, compression rings 200 and 210 mainly for gas sealing,
and a three-piece oil ring 220 mainly for oil controlling and oil sealing are
inserted respectively. In accordance with the reciprocating motion of the
piston 100, outer peripheral sliding surfaces of these rings slide with the
inner wall of a cylinder 300.
The three-piece type combined oil ring 220 comprises a pair of
side rails 230 and 240 arranged at its axially upper and lower portions, and a
spacer expander 250 combined therebetween for pressing the side rails 230
and 240 from inner peripheral side to produce tension on the side rails 230
and 240. Profiles of each of these components are described, for example,
in JIS B 8032-13, "Internal combustion engines-Small diameter piston
rings-Part 13: Expander/segment oil control rings," established on
December 20, 1998, pages 3 to 5.
Due to the ear portions 252 that are formed with an angle to

protrude in the axial direction of the spacer expander 250, the side rails 230
and 240 are pressed with component forces in the radial direction toward the
cylinder wall and in the axial direction toward upper or lower surface of the
ring groove. Therefore, the side rails 230 and 240 can perform sealing with
the cylinder wall and with the upper and lower surfaces of the ring groove
130.
The configuration of such a spacer expander of a combined oil
ring is disclosed in JP06-081950A, for example. In this spacer expander, a
wave shape is formed in the axial direction by gear machining of a metal
strip. The outer peripheral surfaces of the side rails are pressed toward the
inner peripheral surface of the cylinder with the tension generated by the
wave-shaped portion, and thus secures sealing property. In addition, this
wave-shaped portion becomes an inlet and outlet of oil, and effectively
prevents sticking. Moreover, in the inner peripheral portion of the spacer
expander, protruding portions in the axial direction of the piston (ear
portions) are formed for pressing the side rails outward in the radial direction,
and protruding portions are formed in the outer peripheral portion for
supporting the side rails in the axial direction.
With the recent trend toward better fuel consumption of engines,
it has been desired to reduce width and weight of oil rings. As an example of
reducing width in the axial direction of a three-piece type combined oil ring,
JP04-300467A is reported. The expander of this oil ring is made of a steel
strip having a wave shape in the axial direction, in which an upper portion
and a lower portion are alternately located and axially spaced apart in a
circular arrangement and both portions are connected with an intermediate

portion extending in the axial direction. The expander is not inserted
between two rails. Tapered faces are formed on both upper and lower sides
of the outer peripheral surface of the expander. Inner peripheral surfaces of
the upper and lower rails are pushed by the tapered faces so that the rails
contact with the inner peripheral surface of the cylinder. Because the
expander is not inserted between the upper and lower rails, the width of the
oil ring in the axial direction can be reduced.
In JP05-087240A, a spacer expander of a narrow width three-
piece oil ring is reported. The spacer expander is made of a shape steel
material having a substantially lateral T-shape in cross section. In this
spacer expander, side rail supporting surfaces are formed on the top and
bottom of an enlarged portion on outer peripheral side, and upper and lower
pads for pushing side rails are formed by bending end surfaces on inner
peripheral side alternately upward and downward. The pad portions are
bent by plastic working, and have thin material thickness and a low stiffness.
Thus, the pad portions have a high degree of flexibility in displacement.
Therefore, an excellent followability can be obtained in pushing the side rails
toward the inner peripheral surface of the cylinder due to the elasticity of the
pad portions, and better sealing can be maintained even at low tension,
compared to the conventional oil rings.
JP05-106734A discloses a spacer expander of a narrow width
three-piece oil ring. Here, the spacer expander is made of a base plate of a
shape steel material whose outer peripheral side is thick and inner peripheral
side is thin. Slits are formed alternately from the inner peripheral side and
the outer peripheral side. The outer peripheral side portion formed between

the adjacent slits on the outer peripheral side and the inner peripheral side
portion formed between the adjacent slits on the inner peripheral side are
bent alternately upward and downward, and the surfaces facing the outer
peripheral side support side rails. This spacer expander ensures that the
side rails follow irregularities on the inner peripheral surface of the cylinder
because the inner peripheral side portion has a low stiffness, and thus easily
deforms elastically.
PROBLEMS TO BE SOLVED BY THE INVENTION
In a combined oil ring as shown in JP06-081950A, the side rails
are combined with the spacer expander so that the inner peripheral surfaces
of the side rails contact with ear portions of the spacer expander. The
combined width of the oil ring in the axial direction depends on the axial
width of the connecting portion that connects the upper portion and the lower
portion of the wave shape of the spacer expander. Therefore, if the axial
width of the connecting portion of the spacer expander can be reduced, it is
possible to reduce the axial width of the combined oil ring when the spacer
expander is combined with side rails. However, for conventional spacer
expanders, wave shapes have been manufactured by gear machining, and
thus it has been difficult to reduce the axial width of the connecting portion
due to manufacturing reasons. Therefore, there has been a limit in reducing
the combined axial width.
In the configuration of a combined oil ring shown in JP04-
300467A, the contact portions of the rails and the expander are only the
inner peripheral surfaces of the rails and the tapered faces of the expander.

Therefore, it is difficult to control the amount of axial movement of the outer
peripheral portion of the upper and lower rails in the cylinder. If the amount
of movement of the rail outer peripheral surfaces on the cylinder inner
peripheral surface is large, vibration tends to occur between the rail outer
peripheral surfaces and the cylinder inner peripheral surface. This may
inhibit reduction of oil consumption by the width reduction, and may cause
unusual noises.
In a method that uses a shape steel material as shown in JP05-
087240 and JP05-106734A, the steel material itself is expensive in general.
Also, the tension of the spacer expander needs to be controlled by the width
and number of slits that are formed alternately on the outer peripheral side
and the inner peripheral side, and thus, machining process becomes
complicated and restricted. In addition, reduction in width and weight is
limited due to the thickness and weight of the shape steel material itself.
Therefore, the present invention aims to provide a spacer
expander of a combined oil ring with a narrow axial width by simple
processes and at a low cost, in which the spacer expander is excellent in
followability and stability and effective in improving fuel efficiency of engines.
SUMMARY OF THE INVENTION
The present invention provides a spacer expander of a combined
oil ring that comprises a spacer expander and a pair of side rails supported
by the spacer expander, and the axial width of the combined oil ring can be
reduced. The spacer expander of the present invention is made of a flat
strip of metal. Protruding portions in the axial direction of a piston are

formed in the inner peripheral portion of the spacer expander as to press side rails
outward in the radial direction, outer peripheral portions that are adjacent to the
protruding portions in the inner peripheral portion (inner peripheral protruding portions)
are cut off, and protruding portions are formed in the outer peripheral portion that are
adjacent to the cut off portions (slits) as to support side rails in the axial direction.
A spacer expander of the present invention is characterized in that inner
peripheral protruding portions protruding alternately upper and lower in the axial
direction are formed interposing a connecting portion on the inner peripheral side,
wherein slits are provided on the outer peripheral side of said inner peripheral
protruding portions, and said connecting portion extends toward the outer peripheral
side, and wherein tapered faces are provided on the outer peripheral side of said inner
peripheral protruding portions. Preferably, upper and lower supporting portions
protruding in the axial direction are formed on the outer peripheral side of the
connecting portions.
ADVANTAGES OF THE INVENTION
A spacer expander of the present invention is made of a metal strip, and a
wave-shaped profile in the axial direction of inner peripheral side ear potions (inner
peripheral protruding portions) provides tension. Therefore, there is no need to form a
wave-shaped profile on the outer peripheral side for controlling tension as in the
conventional way. Thus, the combined axial width is equal to the sum of the axial
widths of upper and lower side rails and the thickness of the metal strip that forms the
spacer

expander, or the width of the outer peripheral portion of the spacer expander.
Therefore, compared with the case using a spacer expander of a
conventional configuration, the axial width of the combined oil ring can be
greatly reduced. As a result, a smaller and lighter piston can be obtained,
and better fuel efficiency of engines can be realized. In addition, the
connecting portion extending toward the outer peripheral side provides an
excellent fit and stability. Also, by forming upper and lower supporting
portions on the space expander for supporting side rails, a more excellent
stability and followability can be obtained.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig. 1 is a cross sectional view of the configuration of a combined
oil ring according to the present invention.
Fig. 2 is an enlarged perspective view of a part of a spacer
expander of Fig. 1.
Fig. 3 is a cross sectional view of a spacer expander, taken along
line X-X of Fig. 2.
Fig. 4 (a) and Fig. 4 (b) are a schematic top view and a
schematic side view for explaining each part of a spacer expander.
Fig. 5 is a perspective view when the spacer expander is
combined with side rails.
Fig. 6 is a modified example of a spacer expander according to
the present invention.
Fig. 7 is another modified example of a spacer expander
according to the present invention.

Fig. 8 is a graph showing comparison in oil consumption tests.
Fig. 9 is a cross sectional view showing an example of a
conventional oil ring.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
Referring to the drawings, preferred embodiments for
implementing the present invention are described below.
Fig. 1 is a cross sectional view showing a configuration of a
three-piece type combined oil ring according to the present invention. Fig. 2
is an enlarged perspective view of a part of a spacer expander. Fig. 3 is a
vertical cross sectional view of a spacer expander, taken along line X-X of
Fig. 2. In Fig. 1, an oil ring 20 is installed in an oil ring groove 12 of a piston
10 for oil sealing and oil controlling.
When the combined oil ring 20 is installed in the oil ring groove
12 of the piston 10, outer peripheral surfaces of a pair of side rails 30 and 40
contact with the inner peripheral surface of a cylinder 14 at a certain contact
pressure.
As shown in Fig. 2, a spacer expander 50 is made of a metal
strip and has a plurality of inner peripheral protruding portions 51 that
protrude in the axial direction of the piston (hereafter, axial direction) on the
inner peripheral side with a certain intervals. An inner peripheral protruding
portion 51 is composed of an inner peripheral upper protruding portion 52,
and an inner peripheral lower protruding portion 53, wherein protruding
portions are arc shaped and protrude upward and downward respectively.
These protruding portions 52 and 53 are alternately located in the peripheral

direction to form a wave shape (hereafter, inner peripheral wave shape),
interposing flat connecting portions 55.
On the outer peripheral side of the inner peripheral upper and
lower protruding portions 52 and 53, rectangular slits (space portions) 54 are
provided. On the outer peripheral side of the connecting portions 55, outer
peripheral protruding portions 56 are formed. An outer peripheral protruding
portion 56 is composed of an outer peripheral upper protruding portion 57
and an outer peripheral lower protruding portion 58, wherein each protruding
portion protrudes upward or downward in the axial direction from the
connecting portion 55. In the example shown in Fig. 2, the outer peripheral
upper protruding portions 57 and the outer peripheral lower protruding
portions 58 are formed on the outer peripheral side of the connecting
portions 55, and the pattern of an upper protruding portion 57 and a lower
protruding portion 58 is inverted between adjacent connecting portions 55.
Assuming that two adjacent connecting portions 55 are one set or one pair, a
plurality set or pair of the connecting portions 55 are located in the peripheral
direction. Each of the upper protruding portion 57 and the lower protruding
portion 58 has a flat protruding surface, and these surfaces support the side
rails.
In the drawing, the connecting portions 55 are flat, and have
upper and lower protruding portions (supporting portions) 56 at the end
portion of the outer peripheral side, however, the present invention is not
limited to such configuration. For example, even if the connecting portions
are flat but do not have upper and lower protruding portions, as long as the
connecting portions extend toward the outer peripheral side, it becomes

easy to set the combined oil ring to the piston, and the stability of the side
rails also improves. Moreover, the width in the direction of the combined
axis in this case is equal to the sum of the axial widths of upper and lower
side rails and the thickness of the metal strip that forms the spacer
expander, thus, the width can be greatly reduced. Likewise, the portion in
which the upper and lower supporting portions are formed is not limited to
the end portion of the outer peripheral side. For example, grooves extending
in the radial direction can be formed radially on the connecting portion 55 as
to protrude axially upward or downward. The grooves can be formed across
all the area radially from the outer peripheral end to the inner peripheral end
of the connecting portion 55, or can be formed only in part in the radial
direction.
Among the side faces of the inner, peripheral upper and lower
protruding portions 52 and 53, side faces 59 on the side of the slits, that is,
the side faces 59 on the outer peripheral side that contact with side rails, are
formed into tapered faces. As shown in Fig. 3, the taper angle 0 of the
tapered face is the inclination to the perpendicular, and preferably in the
range of 10 to 30 degrees. However, in the spacer expander of the present
invention, sufficient tension to the outer peripheral side is provided only by
the inner peripheral wave shape, thus the side face can be level to the axial
direction (0=0 degree) without being formed into a tapered face.
In the spacer expander 50 of the present invention, tension to the
outer peripheral side is provided by the inner peripheral wave shape that is
made of the inner peripheral upper and lower protruding portions 52 and 53,
and thus the slits 54 have little effect on tension. Therefore, there is no need

to control tension by forming slits (space portions) alternately inner and outer
peripheral sides as shown in JP05-087240A and JP05-106734A. In the
present invention, slits could be formed only on the outer peripheral side,
therefore, machining process can be simplified. Of course, it is possible to
form slits on the inner peripheral side also in the spacer expander 50 of the
present invention.
The tension of the spacer expander 50 is controlled especially by
(1) the number of pitches in the inner peripheral wave shape, (2) the width of
the inner peripheral wave shape in the axial direction, (3) the width of the
inner peripheral wave shape in the radial direction, and (4) the thickness of
the metal strip. Fig. 4 (a) and Fig. 4 (b) are a schematic top view and a
schematic side view of a spacer expander, and sizes of each part are
described with reference to the drawings.
(1) As shown in Fig. 4 (a) and Fig. 4 (b), pitch width P of the inner
peripheral wave shape refers to the width from the center of an inner
peripheral upper protruding portion 52 to the center of an adjacent inner
peripheral lower protruding portion 53, or from the center of an inner
peripheral lower protruding portion 53 to the center of an adjacent inner
peripheral upper protruding portion 52. To reduce dispersion of tension in
contact pressure, it is preferable that the number of pitches in the inner
peripheral wave shape be equal to or more than 50, and more preferably be
equal to or more than 70. The pitch width P is set to provide such pitch
numbers. In general, the pitch width P is on the order of 2.5 mm to 3.5 mm.
(2) The tension of the spacer expander can be controlled also by
the axial width of the inner peripheral wave shape. When the connecting

portion 55 is used as a reference and measured from the connecting portion
55, the axial width of the inner peripheral wave shape is the width (height) H
to the maximum value in the axial direction of the inner peripheral upper
protruding portion 52 or lower protruding portion 53. To provide tension, it is
desirable that the axial width of the inner peripheral wave shape H be made
large. However, it should be noted that, in the state the combined oil ring 20
is installed in the ring groove 12, the upper and lower surfaces of the side
rails 30 and 40 should protrude beyond the protruding surfaces of the inner
peripheral wave shape as shown in Fig. 1.
(3) The tension of the spacer expander can be controlled also by
the width D of the inner peripheral wave shape in the radial direction. The
radial width D of the inner peripheral wave shape can be designed as
appropriate by the radial width of the side rail and by the radial width of the
ring groove 12 of the piston.
(4) To obtain optimal tension, it is desirable that the thickness of
the metal strip that forms the spacer expander be in the range of 0.10 mm to
0.25 mm. The thickness below 0.1 mm may cause problems in strength of
the spacer expander. With the thickness over 0.25 mm, it becomes difficult
for the spacer expander to provide sufficient tension.
In the spacer expander 50 of the present example, as shown in
Fig. 2, the profile of the protruding surfaces of the upper and lower
protruding portions 52 and 53 of inner peripheral wave shape is an arc-
shape (round profile), however, the profile is not limited to such a shape.
The profile can be a mesa profile as shown in Fig. 6 and Fig. 7, or it can be a
protruding portion having, for example, a triangular or rectangular shape,

considering relationships with side rails, i.e., wear, stress occurrence, or the
like.
Referring back to Fig. 1, when the oil ring 20 in which two side
rails 30 and 40 are combined by using the spacer expander 50 is installed in
the ring groove 12, the side rails 30 and 40 are located, respectively, on the
side of the upper surface 16 and on the side of the lower surface 18 of the
ring groove 12. The inner peripheral surfaces of the side rails 30 and 40
contact with the tapered faces 59 of the inner peripheral protruding portions
52 and 53 of the spacer expander 50, and the inner peripheral surfaces are
pressed outward in the radial direction and in the axial direction depending
on the taper angle 9. Concurrently, the outer peripheral protruding portions
57 and 58 of the spacer expander 50 contact with the side rails 30 and 40,
and thus the side rails 30 and 40 are supported in the axial direction. In this
way, side rails 30 and 40 can perform oil scraping of the inner peripheral
surface of the cylinder 14, and sealing on the upper and lower surfaces 16
and 18 of the oil ring groove 12.
Fig. 5 shows a perspective view when a spacer expander 50 is
combined with side rails. The width W of the combined oil ring in the axial
direction is the sum of the protruding height of the outer peripheral
protruding portion 56 (the height from the top end of the upper protruding
portion 57 to the bottom end of the lower protruding portion 58) and the axial
widths of side rails 30 and 40 (for two side rails). Therefore, the width of the
combined oil ring in the axial direction can be greatly reduced.
The axial width W of the combined oil ring 20 is decided by the
protruding height of the outer peripheral protruding portion 56. It is

preferable that the protruding height of the outer peripheral protruding
portion 56 be in the range of 20 micrometers to 120 micrometers. This is
because if the height is below 20 micrometers, oil-flow path becomes too
narrow, which tends to cause sticking. With the height over 120
' becomes large, which tends to cause noises.
As described above, because the tension of the spacer expander
50 is controlled by its inner peripheral wave shape, the profile and size of the
slits 54 (space portions) on the outer peripheral side can be designed only
with viewpoints of strength, light-weighing, or the like, and thus greater
design flexibility can be obtained. Although the profile of the slits 54 of the
spacer expander shown in Fig. 2 is rectangular, shapes other than
rectangular can be adopted. For example, as shown in Fig. 6 and Fig. 7, the
profile of the slits 54a can be a substantially T-shape so that the width of the
slits in the peripheral direction on the inner peripheral side is wide and the
width in the peripheral direction on the outer peripheral side is narrow. By
adopting such shapes, the spacer expander can be made lighter, while
securing the contact area with side rails on the outer peripheral side, and
obtaining stable sealing capability by controlling the movement of the side
rails in the axial direction.
In addition, in the example shown in Fig. 2, a pair of an outer
peripheral upper protruding portion 57 and an outer peripheral lower
protruding portion 58 is formed on the outer peripheral end portion of the
connecting portion 55, but it is not necessarily limited to such an
arrangement. For example, as shown in Fig. 7, an upper protruding portion

57 and, on both sides thereof, two lower protruding portions 58 are formed
on the outer peripheral end portion of a connecting portion 55a, and a lower
protruding portion 58 and, on both sides thereof, two upper protruding
portions 57 are formed on the outer peripheral end portion of a connecting
portion 55b that is adjacent to the connecting portion 55a. Then a plurality of
pairs of such connecting portions 55a and 55b can be located in the
peripheral direction.
Although it is desirable that the profile of the outer peripheral
protruding portions 57 and 58 be flat to secure the contact area with side
rails, it is possible to use other shapes such as a curved shape.
Now, the performance of a combined oil ring using the spacer
expander according to the present invention is compared with the one using
a conventional spacer expander.
As a comparison sample, a conventional spacer expander whose
outer peripheral side connecting portion was formed into a wave shape by
gear machining was formed by using a metal strip having a thickness of 0.2
mm. In this spacer expander, pitch width was 2.5 mm, the number of pitches
was 91, axial width was 2.0 mm, and radial width was 2.2 mm. This spacer
expander was combined with two side rails having a radial length of 1.93 mm
and an axial width of 0.3 mm. The combined oil ring obtained by this
combination had a tension of 10 N, a ring nominal diameter of 75.0 mm, a
combined radial length of 2.55 mm, and a combined axial width of 2.0 mm.
As an example, a spacer expander shown in Fig. 2 was formed
by using a metal strip having a thickness of 0.2 mm. In this example, pitch
width was 3.0 mm, number of pitches was 78, axial width was 0.89 mm, and

radial width was 2.45 mm. This spacer expander was combined with two
rails similar to those of the comparison sample. Obtained combined oil ring
had a tension of 10 N, a ring nominal diameter of 75.0 mm, a combined
radial length of 2.55 mm, and a combined axial width of 1.0 mm.
Engine performance tests were performed by using the
combined oil rings of the comparison sample and example. In the tests, a
1988 cc in-line four-cylinder gasoline engine was operated for 100 hours at
6000 rpm at full load, with a water temperature (at outlet) of 90 degrees
centigrade, and an oil temperature of 100 degrees centigrade.
Fig. 8 shows the amount of oil consumption after the engine
operation was completed. When the spacer expander of the example was
used, the average value of three measurements was 28.3 g/Hr. This is a
17.5 % reduction compared to the case where the spacer expander of the
comparison sample was used, with the average value of three
measurements being 34.3 g/Hr. In addition, noise occurrence due to
vibration between the rail outer peripheral surfaces and the cylinder inner
peripheral surface was not occurred also in the case where the combined oil
ring of the example was used, as same as in the comparison sample.
Although preferred embodiments of the present invention have
been described in detail, the present invention is not limited to such specific
embodiments, and various changes and alterations can be made herein
without departing from the spirit and scope of the invention as defined by the
appended claims.
According to the present invention, the width in the axial direction
of a combined oil ring can be reduced while maintaining a stable followability.

As a result, a smaller and lighter piston can be realized, and a combined oil
ring for internal combustion engines having better fuel efficiency can be
provided.

We claim :
1. A spacer expander, characterized in that inner peripheral protruding
portions protruding alternately upper and lower in the axial direction are formed
interposing a connecting portion on the inner peripheral side, wherein slits are
provided on the outer peripheral side of said inner peripheral protruding portions,
and said connecting portion extends toward the outer peripheral side, and
wherein tapered faces are provided on the outer peripheral side of said inner
peripheral protruding portions.
2. The spacer expander as claimed in claim 1, wherein upper and lower
supporting portions protruding in the axial direction are formed on the outer
peripheral side of said connecting portion.

The present invention provides a spacer expander of a combined oil
ring having a narrow axial width, wherein the spacer expander is excellent in
followability and stability and effective in reducing engine oil consumption.
In a combined oil ring 20 having a spacer expander 50 to be installed
between a pair of upper and lower side rails 30, 40, a plurality of axially
protruding inner peripheral protruding portions 52, 53 are formed on the inner
peripheral side of the spacer expander 50 along its peripheral direction. The
inner peripheral protruding portions press the inner peripheral surface of the side
rails. On the outer peripheral side of the spacer expander, a plurality of slits 54
are formed, and a plurality of connecting portions are located in the peripheral
direction isolated by the slits. On the plurality of connecting portions, axially
protruding outer peripheral protruding portions, 57, 58 are formed.

Documents:

353-kolnp-2006-abstract.pdf

353-kolnp-2006-assignment.pdf

353-kolnp-2006-claims.pdf

353-kolnp-2006-correspondence.pdf

353-KOLNP-2006-CRROSPONDENCE 1.1.pdf

353-kolnp-2006-description (complete).pdf

353-kolnp-2006-drawings.pdf

353-kolnp-2006-examination report.pdf

353-kolnp-2006-form 1.pdf

353-kolnp-2006-form 18.pdf

353-KOLNP-2006-FORM 27.pdf

353-kolnp-2006-form 3.pdf

353-kolnp-2006-form 5.pdf

353-KOLNP-2006-FORM-27.pdf

353-kolnp-2006-gpa.pdf

353-kolnp-2006-granted-abstract.pdf

353-kolnp-2006-granted-assignment.pdf

353-kolnp-2006-granted-claims.pdf

353-kolnp-2006-granted-correspondence.pdf

353-kolnp-2006-granted-description (complete).pdf

353-kolnp-2006-granted-drawings.pdf

353-kolnp-2006-granted-examination report.pdf

353-kolnp-2006-granted-form 1.pdf

353-kolnp-2006-granted-form 18.pdf

353-kolnp-2006-granted-form 3.pdf

353-kolnp-2006-granted-form 5.pdf

353-kolnp-2006-granted-gpa.pdf

353-kolnp-2006-granted-reply to examination report.pdf

353-kolnp-2006-granted-specification.pdf

353-kolnp-2006-reply to examination report.pdf

353-kolnp-2006-specification.pdf


Patent Number 239804
Indian Patent Application Number 353/KOLNP/2006
PG Journal Number 14/2010
Publication Date 02-Apr-2010
Grant Date 31-Mar-2010
Date of Filing 17-Feb-2006
Name of Patentee KABUSHIKI KAISHA RIKEN
Applicant Address 13-5, KUDANKITA 1-CHOME, CHIYODA-KU, TOKYO
Inventors:
# Inventor's Name Inventor's Address
1 KATAYAMA, NOBUO C/O KABUSHIKI KAISHA KIREN KASHIWAZAKI BRANCH, 1-37, HOKUTO-CHO, KASHIWAZAKI-SHI, NIIGATA 9458555
2 USUI, MIYUKI C/O KABUSHIKI KAISHA KIREN KASHIWAZAKI BRANCH, 1-37, HOKUTO-CHO, KASHIWAZAKI-SHI, NIIGATA 9458555
3 NAKAZAWA, MASAHIRO C/O KABUSHIKI KAISHA KIREN KASHIWAZAKI BRANCH, 1-37, HOKUTO-CHO, KASHIWAZAKI-SHI, NIIGATA 9458555
PCT International Classification Number F16J 9/06
PCT International Application Number PCT/JP2004/011749
PCT International Filing date 2004-08-16
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 2003-297108 2003-08-21 Japan