29 Utility Patents
#4,406 in Tokyo
#20,835 in Japan
#97,208 in the World
Forward Citations = 562
Company Filing History:
Senju Metal Industry Co., Ltd.
Showa Shell Sekiyu K.k.

4. 3 out of 19,657

5. 3 out of 26
Sigma Corporation
where one patent can have more than one assignee
Get your Inventor Badge Today