20 Utility and 2 Design Patents
#2,426 in Yokohama
#36,469 in Japan
#168,436 in the World
rank by utility patentsForward Citations = 153
Company Filing History:


Sumitomo Electric Optifrontier Co., Ltd.
4. 2 out of 15
Japan Communication Accessories Manufacturing Co., Ltd.
5. 2 out of 1,622

where one patent can have more than one assignee
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