109 Utility Patents
#113 in Yokohama
#1,231 in Japan
#8,032 in the World
Forward Citations = 907
Company Filing History:

Other
Sumiden Opcom, Ltd.
4. 1 out of 6,872
Sumitomo Chemical Company, Limited
5. 1 out of 8
Sumitomo Electric Industries, Co.
where one patent can have more than one assignee
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