15 Utility and 2 Design Patents
#3,334 in Yokohama
#53,393 in Japan
#248,912 in the World
rank by utility patentsForward Citations = 52
Company Filing History:


Sei Optifrontier Co., Ltd.
4. 2 out of 773

5. 2 out of 1,233
Nhk Spring Co., Ltd.
where one patent can have more than one assignee
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