16 Utility Patents
#2 in Maebahshi
#49,095 in Japan
#228,090 in the World
Forward Citations = 61
Company Filing History:


Sumitomo Pipe & Tube Co., Ltd.
4. 1 out of 1
Gunma Seiko Co., Ltd.
5. 1 out of 929
Sumitomo Metal Industries, Inc.
where one patent can have more than one assignee
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