DETAILED ACTION
Notice of Pre-AIA or AIA Status
The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA .
Response to Arguments
Applicant's arguments filed 01/23/2026 have been fully considered but they are not persuasive and/or moot in view of new rejections.
Applicants’ argument that the reference of Tamaki does not teach the material of the ring and the coating recited in amended claim 1 is not persuasive since the material of the ring and the coating is well known and old, see rejections below.
Applicants’ argument that the reference of Nango does not teach the material of the ring and the coating recited in amended claim 1 is not persuasive since the material of the ring and the coating is well known and old, see rejections below.
Claim Rejections - 35 USC § 103
The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action:
A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made.
Claim(s) 1 is rejected under 35 U.S.C. 103 as being unpatentable over Tamaki (JP2021001612A) in view of Takiguchi et al (US. 20040061291A1).
Tamaki discloses a compression ring (figure 3) to be used in a spark-ignition engine using hydrogen gas fuel and to be fitted to a piston ring groove of a piston installed in a cylinder (e.g. intended use the compression ring of Tamaki is capable of being used in the environment as claimed), wherein an outer periphery shape of the compression ring is a barrel shape (e.g. barrel shape having 131) or an eccentric barrel shape (e.g. figure 3), an abrasion value T of the outer periphery of the compression ring is less than or equal to 10 (e.g. again since the structure of barrel shape is provided Tamaki this limitation is met), wherein the abrasion value T is determined by an abrasion resistance test performed with a reciprocating friction tester under the abrasion resistance test conditions to evaluate an outer peripheral sliding surface of the compression ring (e.g. the compression ring of Tamaki is capable of being tested as defined hereto), TW1 is an amount of abrasion of the outer peripheral sliding surface in the test with dropping of 1 mL/hour of a bearing oil and 0.5 mL/hour of distilled water (e.g. again the compression ring of Tamaki is capable in condition defined hereto), TO1 (um) is as an amount of abrasion of the outer peripheral sliding surface in the test with dropping of only 1 mL/hour of the bearing oil and no distilled water (e.g. again the compression ring of Tamaki is capable in condition defined hereto), and T (um) = TW1 - TO1 (e.g. it is inherent that when one skilled in the art performs first abrasion test where an element is subjected to mixture of oil and water and a second abrasion test where the same element is subjected to only oil, the following T is going to be defined ); and A/T > 100 is satisfied, wherein A(HVO.1) is a surface Vickers hardness of the outer peripheral sliding surface (e.g. the structure of the barrel shape is defined so A/T is going to be as stated and furthermore it is noted that applicant has not provided any particular hardness structure such as material of ring or coating or etc), an abrasion index M of the outer periphery of the compression ring is less than or equal to 0.09 (e.g. M is also going to be defined since the only structure claimed is the barrel shaped which is taught by Tamaki), wherein Ft (N) is defined as a tension of the compression ring (e.g. as seen in figures 1-3 to Tamaki, the compression ring is capable of being in tension by fluid from cylinder assembly shown in figure 1), S13 (mm) is defined as a length (e.g. S11, figure 3) in an axis direction of the outer peripheral sliding surface of the compression ring (e.g. see S11 in figure 3 of Tamaki), and in a case where the piston is disposed so that the outer periphery of the compression ring abuts with a cylinder bore (e.g. the compression ring of Tamaki is capable of contacting a cylinder, see figure 1), D (mm) is defined as an inner diameter of the cylinder bore (e.g. figure 1 shows that a cylinder has an inner diameter where the compression ring is capable of contacting), a11 (mm) is defined as a distance (e.g. a11, figure 3 of Tamaki) in a radius direction between an upper connection point of the compression ring and an inner wall of the cylinder bore (e.g. figure 1 and 3), a12 (mm) is defined as a distance (e.g. a12, figure 3 of Tamaki) in a radius direction between a lower connection point of the compression ring and the inner wall of the cylinder bore (see figures 1 and 3), and Fd = Ft/D, head h = (a11 + a12)/2 (e.g. this is taught by Tamaki, see a11 and a12 in figure 3), outer periphery inclination OSt = h/(S13/2), and the abrasion index M = T x Fd x Ost (e.g. this is also possible since the structure of compression ring with a particular barrel shape is taught, a11, a12 and s11, see figure 3), wherein the abrasion resistance test conditions are as follows: - Stroke: 50 mm - Load: 100 N - Speed: 600 cycles/min - Temperature control of upper test piece: room temperature - Temperature control of lower test piece: room temperature - Bearing oil: Shell Tetra Oil 2SP, Shell Lubricants Japan K.K. - Dropping conditions of bearing oil: dropping once every one minute and controlling the total amount of dropping to 1 mL/hour - Dropping conditions of distilled water: dropping once every one minute and controlling the total amount of dropping to 0.5 mL/hour - Test time: 60 minutes - The test is performed after the trial run is performed under the following conditions. - Load: 20 N - Speed: 100 cycles/min - Temperature of upper test piece before test: room temperature - Temperature of lower test piece before test: room temperature - Bearing oil: Shell Tetra Oil 2SP, Shell Lubricants Japan K.K. - Dropping conditions of bearing oil: dropping once every one minute and controlling the total amount of dropping to 0.08 mL/5 min, and - Test time: 5 minutes (The italicized limitations recite product-by-process limitations. Even though product-by-process claims are limited by and defined by the process, determination of patentability is based on the product itself. The patentability of a product does not depend on its associated methods, only the end result. See MPEP 2113. Since Tamaki teaches a compression ring with a barrel shape, the end result is the same regardless of the method used to test the product).
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Tamaki discloses the invention as claimed above but fails to disclose the piston ring is high-alloy or low-alloy steel and a coating of the compression ring includes at least one selected from the group consisting of PVD coating, DLC coating, hard chrome plating coating and nitride coating. Takiguchi discloses piston rings made of martensitic stainless steel with nitride outer surface (e.g. see paragraph 0034). It would have been obvious to one skilled in the art before the effective filing date of the claimed invention to have the piston ring of Tamaki be made of alloy steel and a coating thereon as taught by Takiguchi, with reasonable expectation of success to reduce wear (e.g. nitride outer surface, see paragraph 0034) and provide sufficient strength to the piston ring (e.g. inherent due to martensitic stainless steel).
Claim(s) 1 is rejected under 35 U.S.C. 103 as being unpatentable over Tamaki (JP2021001612A) in view of Chiba et al (US20130181410A1, paragraphs 0020, 0052 and etc).
Tamaki discloses the invention as claimed above but fails to disclose the piston ring is high-alloy or low-alloy steel and a coating of the compression ring includes at least one selected from the group consisting of PVD coating, DLC coating, hard chrome plating coating and nitride coating. Chiba discloses piston rings made of stainless steel with nitride outer surface (e.g. see paragraph 0020 and 0052). It would have been obvious to one skilled in the art before the effective filing date of the claimed invention to have the piston ring of Tamaki be made of alloy steel and a coating thereon as taught by Chiba, with reasonable expectation of success to reduce wear (e.g. coatings that are nitrided layer or PVD layer or DLC layer, see paragraph 0052 of Chiba) and provide sufficient durability to the piston ring (e.g. see Chiba paragraph 0053, “stainless steel or steel in terms of durability”).
Claim(s) 1 is rejected under 35 U.S.C. 103 as being unpatentable over Nango (US202110164568A1) in view of Sytsma (US. 20150184748A1).
Nango discloses a compression ring (figures 3 and 4) to be used in a spark-ignition engine using hydrogen gas fuel and to be fitted to a piston ring groove of a piston installed in a cylinder (e.g. intended use the compression ring of Nango is capable of being used in the environment as claimed), wherein an outer periphery shape of the compression ring is a barrel shape (e.g. barrel shape having 131) or an eccentric barrel shape (e.g. figures 3 and 4), an abrasion value T of the outer periphery of the compression ring is less than or equal to 10 (e.g. again since the structure of barrel shape is provided Nango this limitation is met), wherein the abrasion value T is determined by an abrasion resistance test performed with a reciprocating friction tester under the abrasion resistance test conditions to evaluate an outer peripheral sliding surface of the compression ring (e.g. the compression ring of Nango is capable of being tested as defined hereto), TW1 is an amount of abrasion of the outer peripheral sliding surface in the test with dropping of 1 mL/hour of a bearing oil and 0.5 mL/hour of distilled water (e.g. again the compression ring of Nango is capable in condition defined hereto), TO1 (um) is as an amount of abrasion of the outer peripheral sliding surface in the test with dropping of only 1 mL/hour of the bearing oil and no distilled water (e.g. again the compression ring of Nango is capable in condition defined hereto), and T (um) = TW1 - TO1 (e.g. it is inherent that when one skilled in the art performs first abrasion test where an element is subjected to mixture of oil and water and a second abrasion test where the same element is subjected to only oil, the following T is going to be defined ), and A/T > 100 is satisfied, wherein A(HVO.1) is a surface Vickers hardness of the outer peripheral sliding surface (e.g. the structure of the barrel shape is defined so A/T is going to be as stated and furthermore it is noted that applicant has not provided any particular hardness structure such as material of ring or coating or etc), an abrasion index M of the outer periphery of the compression ring is less than or equal to 0.09 (e.g. M is also going to be defined since the only structure claimed is the barrel shaped which is taught by Nango), wherein Ft (N) is defined as a tension of the compression ring (e.g. as seen in figures 1-4 to Nango and the compression ring is capable of being in tension by fluid from cylinder assembly shown in figure 1), S13 (mm) is defined as a length (e.g. S11, figures 3 and 4) in an axis direction of the outer peripheral sliding surface of the compression ring (e.g. see S11 in figures 3-4 of Nango), and in a case where the piston is disposed so that the outer periphery of the compression ring abuts with a cylinder bore (e.g. the compression ring of Nango is capable of contacting a cylinder, see figure 1), D (mm) is defined as an inner diameter of the cylinder bore (e.g. figure 1 shows that a cylinder has an inner diameter where the compression ring is capable of contacting), a11 (mm) is defined as a distance (e.g. a11, figures 3-4 of Nango) in a radius direction between an upper connection point of the compression ring and an inner wall of the cylinder bore (e.g. figure 1 and 3), a12 (mm) is defined as a distance (e.g. a12, figures 3-4 of Nango) in a radius direction between a lower connection point of the compression ring and the inner wall of the cylinder bore (see figures 1 and 3), and Fd = Ft/D, head h = (a11 + a12)/2 (e.g. this is taught by Nango, see a11 and a12 in figure 3), outer periphery inclination OSt = h/(S13/2), and the abrasion index M = T x Fd x Ost (e.g. this is also possible since the structure of compression ring with a particular barrel shape is taught, a11, a12 and s11, see figure 3), wherein the abrasion resistance test conditions are as follows: - Stroke: 50 mm - Load: 100 N - Speed: 600 cycles/min - Temperature control of upper test piece: room temperature - Temperature control of lower test piece: room temperature - Bearing oil: Shell Tetra Oil 2SP, Shell Lubricants Japan K.K. - Dropping conditions of bearing oil: dropping once every one minute and controlling the total amount of dropping to 1 mL/hour - Dropping conditions of distilled water: dropping once every one minute and controlling the total amount of dropping to 0.5 mL/hour - Test time: 60 minutes - The test is performed after the trial run is performed under the following conditions. - Load: 20 N - Speed: 100 cycles/min - Temperature of upper test piece before test: room temperature - Temperature of lower test piece before test: room temperature - Bearing oil: Shell Tetra Oil 2SP, Shell Lubricants Japan K.K. - Dropping conditions of bearing oil: dropping once every one minute and controlling the total amount of dropping to 0.08 mL/5 min, and - Test time: 5 minutes (The italicized limitations recite product-by-process limitations. Even though product-by-process claims are limited by and defined by the process, determination of patentability is based on the product itself. The patentability of a product does not depend on its associated methods, only the end result. See MPEP 2113. Since Nango teaches a compression ring with a barrel shape in figures 3-4, the end result is the same regardless of the method used to test the product).
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Nango discloses the invention as claimed above but fails to disclose the piston ring is high-alloy or low-alloy steel and a coating of the compression ring includes at least one selected from the group consisting of PVD coating, DLC coating, hard chrome plating coating and nitride coating. Sytsma discloses piston rings made of stainless steel or alloy steel with nitride outer surface (e.g. see paragraph 0043). It would have been obvious to one skilled in the art before the effective filing date of the claimed invention to have the piston ring of Nango be made of alloy steel and a coating thereon as taught by Sytsma, with reasonable expectation of success to reduce wear (e.g. coatings that are nitrided layer or PVD layer or DLC layer, see paragraph 0043 of Sytsma) and provide sufficient durability to the piston ring (e.g. inherent due to steel or stainless steel).
Claim(s) 1 is rejected under 35 U.S.C. 103 as being unpatentable over Nango (US202110164568A1) in view of Abe (US. 7354045).
Nango discloses the invention as claimed above but fails to disclose the piston ring is high-alloy or low-alloy steel and a coating of the compression ring includes at least one selected from the group consisting of PVD coating, DLC coating, hard chrome plating coating and nitride coating. Abe et al discloses piston rings made of stainless steel or alloy steel (“In the present embodiment, material for forming the oil ring is not particularly limited as long as it has an appropriate toughness, and when the oil ring is a two-piece oil ring, as long as the material is not deformed by tension from the expander, specifically, steel which is used in the conventional oil ring. Among the above, martensitic stainless steel (SUS440, SUS410 material), 10Cr, 8Cr, alloy tool steel (SKD material), SKD61, SWOSC--V, SWRH equivalent and the like are preferably used.”) with nitride outer surface (e.g. “The ion nitride film or the ion plating film among the above surface treatment is preferably formed only on the outer peripheral surface. Specific examples of types of the ion plating film are a Cr--N type film, a Cr--B--N type film, a Ti--N type film and the like.”). It would have been obvious to one skilled in the art before the effective filing date of the claimed invention to have the piston ring of Nango be made of alloy steel and a coating thereon as taught by Abe, with reasonable expectation of success to reduce wear (e.g. coatings that are nitrided layer or PVD layer or DLC layer reduce wear) and provide sufficient durability to the piston ring (e.g. inherent due to steel or stainless steel).
Conclusion
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/VISHAL A PATEL/Primary Examiner, Art Unit 3675
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