Granted Patent
Utility
US 5,200,001 · App. 07/619,642
Permanent magnet
Inventors:
Satoshi Hirosawa, Atsushi Hanaki, Hiroyuki Tomizawa, Shuji Mino
Patented Case
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Granted: Apr 6, 1993
Filed: Nov 29, 1990
Inventors
Satoshi Hirosawa
Atsushi Hanaki
Hiroyuki Tomizawa
Shuji Mino
Assignee (at issue)
Sumitomo Special Metals Co., Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.