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Teikoku Piston Ring Co., Ltd.

USPTO Granted Patents = 70

EPO Patents = 3

Trademarks = 1

Forward Citations = 983

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98 inventors (with patents filed for the assignee):

Nobuyuki Yamashita (12 out of 17 patents)

Shoji Tanaka (9 out of 9 patents)

Masao Ishida (8 out of 8 patents)

4. Kazuhiko Kita (8 out of 28 patents)

5. Akira Harayama (8 out of 8 patents)

6. Akihisa Inoue (7 out of 64 patents)

7. Hitoshi Yamaguchi (7 out of 22 patents)

8. Tsuyoshi Masumoto (7 out of 49 patents)

9. Hiroto Fukutome (6 out of 6 patents)

10. Yoshio Harakawa (6 out of 6 patents)

11. Yoshio Naruse (5 out of 5 patents)

12. Akihisa Inoue (5 out of 69 patents)

13. Giichiro Saito (4 out of 12 patents)

14. Takatsugu Iwashita (4 out of 4 patents)

15. Masahiro Oguchi (4 out of 10 patents)

Core Competencies:

Piston Ring

Cylinder Liner

Oil Ring

Sintered Alloy

Hard Coating Material

Aluminum-Based Alloy

Internal Combustion Engines

Wear-Resistant Materials

Composite Alloys

Atomized Alloy Powder

Sliding Members

Casting Structures

70 patents: Sort by Forward Citations

1. 8616556 - Combined oil ring (2013-12-31),

2. 8402881 - Insert casting structure (2013-03-26),

3. 8365696 - Piston device for internal combustion engines (2013-02-05),

4. 8037860 - Cylinder liner and engine (2011-10-18),

5. 7963212 - Combination of a piston and a piston ring (2011-06-21),

6. 7882818 - Cylinder liner and engine (2011-02-08),

7. 7717079 - Engine (2010-05-18),

8. 7383805 - Cylinder liner for insert casting and method for manufacturing thereof (2008-06-10),

9. 7077402 - Combined oil ring (2006-07-18),

10. 6951579 - Sintered alloy for valve seats, valve seat and manufacturing method thereof (2005-10-04),

11. 6508473 - Piston ring (2003-01-21),

12. 6454271 - Combined oil ring (2002-09-24),

13. 6372369 - Hard film, sliding member covered with hard film, and manufacturing method thereof (2002-04-16),

14. 6325385 - Piston ring (2001-12-04),

15. 6279913 - Sliding member and manufacturing method thereof (2001-08-28),

Teikoku Piston Ring Co., Ltd. is a leading manufacturer of piston rings for various applications. With headquarters in Japan, the company has been in operation since 1929. Teikoku Piston Ring specializes in the production of high-quality piston rings used in automotive, industrial, and marine engines. They provide innovative solutions, utilizing advanced technologies and rigorous testing to ensure superior performance and reliability. Teikoku Piston Ring has a global presence and is committed to delivering exceptional products and services to their customers worldwide.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

70 Patents

#586 in Tokyo

#1,379 in Japan

#10,342 in the World

Teikoku Piston Ring Co., Ltd.

Forward Citations = 983

98 inventors:

Nobuyuki Yamashita (12 out of 17 patents)

Shoji Tanaka (9 out of 9 patents)

Masao Ishida (8 out of 8 patents)

4. Kazuhiko Kita (8 out of 28 patents)

5. Akira Harayama (8 out of 8 patents)

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