35 Utility and 2 Design Patents
#1,148 in Yokohama
#15,258 in Japan
#71,722 in the World
rank by utility patentsForward Citations = 358
Company Filing History:

Sei Optifrontier Co., Ltd.

4. 2 out of 1,622

5. 1 out of 6
Toyokuni Electric Cable Co., Ltd.
where one patent can have more than one assignee
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