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Nippon Piston Ring Co., Ltd.

USPTO Granted Patents = 230

EPO Patents = 27

Trademarks = 6

Forward Citations = 1,755

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221 inventors (with patents filed for the assignee):

Hiroshi Sakamaki (28 out of 37 patents)

Yukio Horikoshi (20 out of 22 patents)

Shunsuke Takeguchi (18 out of 18 patents)

4. Shigeru Urano (17 out of 18 patents)

5. Katsuaki Ogawa (16 out of 18 patents)

6. Yoshikatsu Nakamura (16 out of 16 patents)

7. Teruo Takahashi (14 out of 21 patents)

8. Takeshi Hiraoka (14 out of 14 patents)

9. Osamu Kawamura (13 out of 13 patents)

10. Susumu Sugishita (13 out of 14 patents)

11. Hiroyuki Sugiura (11 out of 41 patents)

12. Kentaro Takahashi (11 out of 11 patents)

13. Hiroshi Oshige (10 out of 10 patents)

14. Genkichi Umeha (10 out of 10 patents)

15. Motonobu Onoda (9 out of 9 patents)

Core Competencies:

Sliding Member

Piston Ring

Combined Oil Ring

Iron-Based Sintered Alloy

Valve Seat Insert

Coating Film

Fusible Plug

Internal Combustion Engine

Titanium Alloy

Wear Resistance

Rotating Electric Machine

Hard Carbon Coating

230 patents: Sort by Forward Citations

1. 12516731 - Sliding member, manufacturing method thereof, and coating film (2026-01-06),

2. 11946010 - Sliding member, manufacturing method thereof, and coating film (2024-04-02),

3. 11873780 - Combined oil ring (2024-01-16),

4. 11859766 - Fusible plug (2024-01-02),

5. 11846009 - Hard particle powder for sintered body (2023-12-19),

6. 11739840 - Piston ring (2023-08-29),

7. 11692248 - Sliding member (2023-07-04),

8. 11549408 - Iron-based sintered alloy valve seat for internal combustion engine (2023-01-10),

9. 11293548 - Sliding member and coating film (2022-04-05),

10. 11261519 - Coating film, manufacturing method therefor, and PVD apparatus (2022-03-01),

11. 11111875 - Sliding structure for internal combustion engine, method for controlling idling operation, and method for controlling operation of internal combustion engine (2021-09-07),

12. 11051904 - Marker for use in living body and instrument set for inserting marker for use in living body (2021-07-06),

13. 11047479 - Method for producing piston ring with recess (2021-06-29),

14. 10724636 - Combined oil ring (2020-07-28),

15. 10669613 - Titanium alloy (2020-06-02),

NIPPON PISTON RING CO., LTD. is a leading manufacturer of piston rings and other engine components. With over 100 years of experience, we have established a strong reputation for delivering high-quality and reliable products to the automotive industry. Our advanced manufacturing processes and strict quality control ensure that our piston rings meet the highest standards. Visit our website to learn more about our company and explore our range of products.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Jan 6 2026

230 Patents

#10 in

#617 in

#3,621 in the World

Nippon Piston Ring Co., Ltd.

Forward Citations = 1,755

221 inventors:

Hiroshi Sakamaki (28 out of 37 patents)

Yukio Horikoshi (20 out of 22 patents)

Shunsuke Takeguchi (18 out of 18 patents)

4. Shigeru Urano (17 out of 18 patents)

5. Katsuaki Ogawa (16 out of 18 patents)

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