5 Utility Patents
#28,999 in Tokyo
#162,524 in Japan
#826,892 in the World
Forward Citations = 37
Company Filing History:
Sumitomo Pipe & Tube Co., Ltd.
Nippon Steel & Sumitomo Metal Corporation

4. 2 out of 929
Sumitomo Metal Industries, Inc.
5. 1 out of 3
Nippon Steel & Sumikin Pipe Co., Ltd.
where one patent can have more than one assignee
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