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For the Inventor, By the Inventor

Omiya, Japan

Yoshikatsu Nakamura

This inventor holds 16 USPTO granted patents. Top assignees: Nippon Piston Ring Co., Ltd., Juki Corporation. Active years: 1976-2001.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yoshikatsu Nakamura. Retrieved from https://idiyas.com/inventor/yoshikatsu-nakamura

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 16

% Patents Active = 100.0

Average Co-Inventor Count = 2.8

ph-index = 8

Forward Citations = 148(Granted Patents)


Location History:

  • Yokohama, JA (1976)
  • Ohmiya, JP (1981)
  • Saitama, JP (1986)
  • Omiya, JP (1982 - 1991)
  • Nogi, JP (1993)
  • Shimotsuga-gun, JP (1998 - 1999)
  • Tochigi-ken, JP (1996 - 2001)

Company Filing History:

goldMedal16 out of 230 
 
Nippon Piston Ring Co., Ltd.
 patents
silverMedal1 out of 280 
 
Juki Corporation
 patents
where one patent can have more than one assignee

Years Active: 1976-2001

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16 patents (USPTO):Explore Patents
1. 6261389 - Synchronizer ring (2001-07-17),
2. 5900559 - Synchronizer ring (1999-05-04),
3. 5778530 - Method of manufacturing a camshaft (1998-07-14),
4. 5542990 - Camshaft (1996-08-06),
5. 5272930 - Mechanical element having a shaft pressure-fitted into an engaging (1993-12-28),
6. 4996022 - Process for producing a sintered body (1991-02-26),
7. 4870931 - Rocker arm having wear resistant scuffing resistant portion (1989-10-03),
8. 4632074 - Wear-resistant member for use in internal combustion engine and method (1986-12-30),
9. 4583502 - Wear-resistant member for use in an internal combustion engine (1986-04-22),
10. 4409294 - Sliding member for use in an internal combustion engine (1983-10-11),
11. 4360383 - Abrasion resistant sintered alloy for internal combustion engines (1982-11-23),
12. 4345943 - Abrasion resistant sintered alloy for internal combustion engines (1982-08-24),
13. 4345942 - Abrasion resistant sintered alloy for internal combustion engines (1982-08-24),
14. 4311525 - Sliding member for use in internal combustion engine (1982-01-19),
15. 4243414 - Slidable members for prime movers (1981-01-06),

Title: **Yoshikatsu Nakamura: A Pioneer in Synchronizer Ring Innovations**

Introduction

Yoshikatsu Nakamura, an accomplished inventor based in Omiya, Japan, has significantly contributed to the field of automotive components through his innovative designs. With a remarkable portfolio of 16 patents, Nakamura has dedicated his career to improving the performance and reliability of synchronizer rings used in speed change gears. His work is noted for its intricate materials science and engineering applications.

Latest Patents

Nakamura's latest patents focus on enhancing the strength and abrasion resistance of synchronizer rings. His first patent describes a synchronizer ring made from a specific Fe sintered alloy. This alloy composition includes Carbon (C) ranging from 0.2% to 1.0%, Nickel (Ni) from 1.0% to 6.0%, Molybdenum (Mo) from 0.6% to 3.0%, and Copper (Cu) from 1.0% to 4.0%. The remaining composition consists of iron and inevitable impurities, emphasizing qualities like martensite and bainite.

His second patent further innovates on this idea by providing a synchronizer ring that features an internal circumferential surface designed for synchronized sliding with a rotating counterpart. This surface undergoes a special aqueous vapor treatment to develop an iron oxide film, promoting increased durability. The technology explores surface roughness metrics and the application of blasting treatments to ensure optimal performance and longevity.

Career Highlights

Throughout his career, Yoshikatsu Nakamura has worked with esteemed companies, including Nippon Piston Ring Co., Ltd. and Juki Corporation. His experiences at these organizations have played a crucial role in shaping his inventive approaches and applications. His dedication to engineering excellence has positioned him as a key figure in the industry.

Collaborations

Nakamura has collaborated with notable professionals such as Kentaro Takahashi and Masajiro Takeshita. These partnerships have allowed for the exchange of innovative ideas and strategies, further solidifying his influence in the field of automotive technology.

Conclusion

Yoshikatsu Nakamura's contributions to the development of synchronizer rings have significantly advanced the engineering aspects of automotive components. With a robust patent portfolio and a collaborative approach, he remains an integral figure in the innovation landscape. His work exemplifies the impact of dedicated inventors in driving technological progress and enhancing product performance in the automotive industry.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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