Prosecution Insights
Last updated: April 19, 2026
Application No. 18/866,174

OIL RING AND METHOD FOR MANUFACTURING OIL RING

Non-Final OA §103
Filed
Nov 15, 2024
Examiner
BYRD, EUGENE G
Art Unit
3675
Tech Center
3600 — Transportation & Electronic Commerce
Assignee
Nippon Piston Ring Co. Ltd.
OA Round
1 (Non-Final)
69%
Grant Probability
Favorable
1-2
OA Rounds
2y 12m
To Grant
79%
With Interview

Examiner Intelligence

Grants 69% — above average
69%
Career Allow Rate
580 granted / 836 resolved
+17.4% vs TC avg
Moderate +10% lift
Without
With
+9.8%
Interview Lift
resolved cases with interview
Typical timeline
2y 12m
Avg Prosecution
37 currently pending
Career history
873
Total Applications
across all art units

Statute-Specific Performance

§103
59.5%
+19.5% vs TC avg
§102
24.9%
-15.1% vs TC avg
§112
12.8%
-27.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 836 resolved cases

Office Action

§103
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 . Election/Restrictions Applicant’s election without traverse of 1-7 in the reply filed on 9/23/25 is acknowledged. Claim Rejections - 35 USC § 103 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. 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) 1-4 and 7 is/are rejected under 35 U.S.C. 103 as being unpatentable over Katumaru et al. (US 7077402). Regarding claim 1, Katumaru et al. discloses an oil ring 4 Fig. 1A that is a multi-piece-type oil ring provided on a piston 1 of an internal combustion engine comprising a ring body 5 including a rail 7, 8, and an expander 6 applying a tensile force to the ring body, wherein: the rail of the ring body is provided with a film 8 formed by means of a physical vapor deposition treatment; an outer peripheral face of the rail formed by the film includes: an actual land face 11a Fig. 1B that is formed to have a strip shape that extends in a circumferential direction and that abuts against and slides on an inner wall face 2a of a cylinder 2 of the internal combustion engine; and an inclined face 11b that continues from an edge of the actual land face in an axial direction to an outside in the axial direction and has a larger distance from the inner wall face on a further outside in the axial direction, but fails to explicitly disclose the process in which the inclined face includes a face obtained by polishing or grinding a surface of the film along the circumferential direction. Nevertheless, 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 method of production. If the product in the product-by-process claim is the same as or obvious from a product of the prior art, the claim is unpatentable even though the prior product was made by a different process. In re Thorpe, 777 F.2d 695, 698, 227 USPQ 964, 966 (Fed. Cir. 1985) For the purposes of examination, product by process claims are not limited to the manipulation of the recited steps, only the structure implied by the steps. See MPEP 2113. In the present case, the recited steps imply the reference provided discloses the inclined face structure. Regarding claim 2, Katumaru et al. as modified discloses the invention as claimed above but fails to explicitly disclose wherein the actual land face is constituted by a face obtained by polishing or grinding a surface of the film along the axial direction. Nevertheless, 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 method of production. If the product in the product-by-process claim is the same as or obvious from a product of the prior art, the claim is unpatentable even though the prior product was made by a different process. In re Thorpe, 777 F.2d 695, 698, 227 USPQ 964, 966 (Fed. Cir. 1985) For the purposes of examination, product by process claims are not limited to the manipulation of the recited steps, only the structure implied by the steps. See MPEP 2113. In the present case, the recited steps imply the reference provided discloses the inclined face structure. Regarding claim 3, Katumaru et al. as modified discloses the invention as claimed above but fails to explicitly disclose wherein, in a case where a position in which an inclination angle of the inclined face with reference to the axial direction is 7° is defined as an assessment position, a reduced peak height Rpk obtained by measuring the assessment position along the circumferential direction is 0.15 μm or less. Nevertheless, it would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to modify the angle of the inclined face to any number of positions (i.e. 0.15 μm or less) disclosed by Applicant, since it has been held that where the general conditions of a claim are disclosed in the prior art, discovering the optimum or workable ranges involves only routine skill in the art. In re Aller, 105 USPQ 233. Regarding claim 4, Katumaru et al. as modified discloses the invention as claimed above but fails to explicitly disclose wherein, in a case where a position in which an inclination angle of the inclined face with reference to the axial direction is 7° is defined as an assessment position, a material ratio Rmr, in a case of generating a 0.3 μm height decrease with a 0.5% position as a starting point, obtained by measuring the assessment position along the circumferential direction is 35% or more. Nevertheless, it would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to modify the angle of the inclined face to any number of positions (i.e. 35% or more) disclosed by Applicant, since it has been held that where the general conditions of a claim are disclosed in the prior art, discovering the optimum or workable ranges involves only routine skill in the art. In re Aller, 105 USPQ 233. Regarding claim 7, Katumaru et al. as modified discloses wherein the film 8 is a chromium nitride-based alloy film or a hard carbon film (Col. 5, Ln. 26). Allowable Subject Matter Claims 5 and 6 are objected to as being dependent upon a rejected base claim, but would be allowable if rewritten in independent form including all of the limitations of the base claim and any intervening claims. The following is a statement of reasons for the indication of allowable subject matter: In view of a review of the prior art by the Examiner; the prior art of record neither teaches nor suggests all of the claimed subject matter of claims 5 and 6 including where the inclined face includes a hairline that extends in the circumferential direction. There is no motivation to modify the prior art references, absent the applicant’s own disclosure, in the manner required by the claims. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to EUGENE G BYRD whose telephone number is (571)270-1824. The examiner can normally be reached Monday-Friday 9am-5:30pm. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Kristina Fulton can be reached at 5712727376. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /EUGENE G BYRD/Primary Examiner, Art Unit 3675
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Prosecution Timeline

Nov 15, 2024
Application Filed
Jan 10, 2026
Non-Final Rejection — §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12595847
ENERGIZING ELEMENT AND METHODS OF MAKING AND USING THE SAME
2y 5m to grant Granted Apr 07, 2026
Patent 12595848
SOLID PLATE AND STUFFING BOX COMPRISING THE SOLID PLATE
2y 5m to grant Granted Apr 07, 2026
Patent 12584416
O-RING FOR GAS TURBINE ENGINE
2y 5m to grant Granted Mar 24, 2026
Patent 12578017
PISTON RING
2y 5m to grant Granted Mar 17, 2026
Patent 12577947
JUNK RING FOR RECIPROCATING PUMP
2y 5m to grant Granted Mar 17, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
69%
Grant Probability
79%
With Interview (+9.8%)
2y 12m
Median Time to Grant
Low
PTA Risk
Based on 836 resolved cases by this examiner. Grant probability derived from career allow rate.

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