23 Utility and 2 Design Patents
#6,039 in Tokyo
#29,905 in Japan
#138,677 in the World
rank by utility patentsForward Citations = 234
Company Filing History:


Sumco Corporation
4. 3 out of 8,888

5. 2 out of 51
Mitsubishi Materials Silicon Corporation
where one patent can have more than one assignee
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