% Expired Patents = 40.0

Forward Citations = 69

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8 inventors (with patents filed for the assignee):

Masao Koizumi (2 out of 2 patents)

Satoshi Hasaka (1 out of 6 patents)

Yutaka Horiuchi (1 out of 29 patents)

4. Yoshio Nuiya (1 out of 28 patents)

5. Nobuyuki Kawamura (1 out of 5 patents)

6. Toshiaki Kikuchi (1 out of 1 patent)

7. Koichi Ohashi (1 out of 1 patent)

8. Chiba Taku (1 out of 1 patent)

5 patents: Sort by Forward Citations

1. 7357153 - Pressure-reducing valve for high-pressure gas cylinders (2008-04-15),

2. 7225810 - Valve for use in high pressure gas containers (2007-06-05),

3. 6910602 - Container valve (2005-06-28),

4. 6685164 - Control valve and diaphragm for use in the control valve (2004-02-03),

5. 6367499 - Safety valve (2002-04-09),

Company Overview

Hamai Industries Limited is a leading manufacturer of precision gear cutting tools and machinery. With over 70 years of experience in the industry, Hamai Industries is known for their high-quality products and innovative solutions. Their extensive product range includes gear hobbing machines, gear shaving machines, gear chamfering machines, and more. They serve a wide variety of industries, including automotive, aerospace, and defense.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

5 Patents

#2,721 in Tokyo

#6,652 in Japan

Tokyo, Japan

Hamai Industries Limited

Forward Citations = 69

8 inventors:

Masao Koizumi (2 out of 2 patents)

Satoshi Hasaka (1 out of 6 patents)

Yutaka Horiuchi (1 out of 29 patents)

4. Yoshio Nuiya (1 out of 28 patents)

5. Nobuyuki Kawamura (1 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hamai Industries Limited. Retrieved from https://idiyas.com/company/hamai-industries

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]