19 Utility and 2 Design Patents
#2,595 in Yokohama
#39,220 in Japan
#181,321 in the World
rank by utility patentsForward Citations = 255
Company Filing History:

Sei Optifrontier Co., Ltd.
Other
4. 1 out of 5,289

5. 1 out of 15
Japan Communication Accessories Manufacturing Co., Ltd.
where one patent can have more than one assignee
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