11 Utility and 2 Design Patents
#4,500 in Yokohama
#76,844 in Japan
#362,319 in the World
rank by utility patentsForward Citations = 44
Company Filing History:

Sumitomo Electric Optifrontier Co., Ltd.
Sei Optifrontier Co., Ltd.
4. 3 out of 15
Japan Communication Accessories Manufacturing Co., Ltd.
5. 2 out of 28

where one patent can have more than one assignee
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