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For the Inventor, By the Inventor

Aichi, Japan

Yoshimura Company

Calculating rank
USPTO Granted Patents = 8

% Expired Patents = 75.0


Forward Citations = 21

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4 inventors (with patents filed for the assignee):

goldMedal Hyoji Yoshimura (8 out of 10 patents)

silverMedal Hirokazu Morii (4 out of 16 patents)

bronzeMedal Kenichiro Hirao (1 out of 6 patents)

4.  Kazutaka Maruyama (1 out of 4 patents)

5.  Katsumi Nakamura (87 patents)

6.  Yoshimura Hyoji (0 patent)

7.  Morii Hirokazu (0 patent)

8.  Hirao Kenichiro (0 patent)


8 patents:

1. 9447711 - Method for production of valve head portion of hollow engine valve and hollow engine valve (2016-09-20),
2. 9302317 - Method for manufacturing hollow engine valve (2016-04-05),
3. 9194263 - Method for production of valve head portion of hollow engine valve and hollow engine valve (2015-11-24),
4. 8881391 - Method for producing hollow engine valve (2014-11-11),
5. 8713793 - Method for producing metallic-sodium-filled engine valve (2014-05-06),
6. 8650752 - Method for manufacturing valve umbrella portion of hollow engine valve, press device of valve umbrella portion of hollow engine valve, and hollow engine valve (2014-02-18),
7. 8561297 - Method for producing engine valve in which sodium metal is sealed (2013-10-22),
8. 8522434 - Method for production of valve head portion of hollow engine valve and hollow engine valve (2013-09-03),
Company Overview
Yoshimura Company is a Japanese company that specializes in manufacturing high-performance exhaust systems for motorcycles, automobiles, and marine vehicles. With a history dating back to 1954, Yoshimura has established a reputation for quality, performance, and innovation in the industry. In addition to exhaust systems, the company also produces engine components, racing accessories, and apparel for motorsports enthusiasts.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

8 Patents

#111 in Aichi

#5,050 in Japan

Aichi, JP
Aichi, Japan

Yoshimura Company

Forward Citations = 21

4 inventors:

goldMedal Hyoji Yoshimura (8 out of 10 patents)

silverMedal Hirokazu Morii (4 out of 16 patents)

bronzeMedal Kenichiro Hirao (1 out of 6 patents)

4.  Kazutaka Maruyama (1 out of 4 patents)

5.  Katsumi Nakamura (87 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Yoshimura Company. Retrieved from https://idiyas.com/company/yoshimura-company

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

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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