10 Utility Patents
#4,435 in Osaka
#85,432 in Japan
#406,148 in the World
Forward Citations = 11
Company Filing History:

Sei Optifrontier Co., Ltd.
Japan Communication Accessories Manufacturing Co., Ltd.
4. 2 out of 947

5. 2 out of 46
Sumitomo Electric Optifrontier Co., Ltd.
where one patent can have more than one assignee
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