Granted Patent
Utility
US 4,858,281 · App. 07/181,394
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Inventors:
Hirokazu Watanabe, Masamichi Shinmi
Patented Case
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Granted: Aug 22, 1989
Filed: Apr 14, 1988
Inventors
Hirokazu Watanabe
Masamichi Shinmi
Assignee (at issue)
Yoshida Kogyo K.K.
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.