19 Utility and 3 Design Patents
#2,595 in Yokohama
#39,220 in Japan
#181,319 in the World
rank by utility patentsForward Citations = 178
Company Filing History:

Sei Optifrontier Co., Ltd.

4. 3 out of 1,622

5. 1 out of 156
Seikoh Giken Co., Ltd.
where one patent can have more than one assignee
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