57 Utility and 1 Design Patents
#24 in Ibaraki
#5,844 in Japan
#29,641 in the World
rank by utility patentsForward Citations = 392
Company Filing History:

Sumitomo Osaka Cement Co., Ltd.

4. 7 out of 2,893

5. 6 out of 15,644

where one patent can have more than one assignee
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