7 Utility and 2 Design Patents
#21,541 in Tokyo
#119,357 in Japan
#574,846 in the World
rank by utility patentsForward Citations = 52
Company Filing History:
Sumitomo Forestry Co., Ltd.
Kanai Co., Ltd.
Nikkato Corporation
4. 1 out of 46
Showa Shell Sekiyu K.k.
5. 1 out of 20,961

where one patent can have more than one assignee
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