Forward Citations = 16

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2 inventors (with patents filed for the assignee):

Katsumi Otsuka (2 out of 5 patents)

Tetsuo Shimoishi (1 out of 4 patents)

2 patents: Sort by Forward Citations

1. 4362683 - Apparatus and method for producing a continuous nib rod for a writing (1982-12-07),

2. 4065215 - Writing instrument (1977-12-27),

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USPTO Data Jan 1 1976 - Oct 13 2026

2 Patents

#48 in both of

#11,133 in Japan

both of, Japan

Toplan Manufacturing Inc.

Forward Citations = 16

2 inventors:

Katsumi Otsuka (2 out of 5 patents)

Tetsuo Shimoishi (1 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Toplan Manufacturing Inc.. Retrieved from https://idiyas.com/company/toplan-manufacturing

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]