Shirouma Plastics Kogyo Inc.

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USPTO Granted Patents = 2

Forward Citations = 32

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7 inventors (with patents filed for the assignee):

Yoshimasa Tahara (1 out of 2 patents)

Takahashi Masayoshi (1 out of 1 patent)

Ooya Hajime (1 out of 1 patent)

4. Tsushima Masahiro (1 out of 1 patent)

5. Kamishima Kazuo (1 out of 1 patent)

6. Takashima Hiroaki (1 out of 1 patent)

7. Kawada Yoshio (1 out of 1 patent)

2 patents: Sort by Forward Citations

1. 5582316 - Cap operating mechanism (1996-12-10),

2. 4901435 - Cutter lid of rise-and-rotation type for container (1990-02-20),

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USPTO Data Jan 1 1976 - Oct 20 2026

2 Patents

#59 in Toyama 939-0643

#11,139 in Japan

Toyama, Japan

Shirouma Plastics Kogyo Inc.

Forward Citations = 32

7 inventors:

Yoshimasa Tahara (1 out of 2 patents)

Takahashi Masayoshi (1 out of 1 patent)

Ooya Hajime (1 out of 1 patent)

4. Tsushima Masahiro (1 out of 1 patent)

5. Kamishima Kazuo (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Shirouma Plastics Kogyo Inc.. Retrieved from https://idiyas.com/company/shirouma-plastics-kogyo

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]