Granted Patent
Utility
US 4,751,771 · App. 07/024,661
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Inventor:
Hirokazu Watanabe
Patented Case
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Granted: Jun 21, 1988
Filed: Mar 11, 1987
Inventor
Hirokazu Watanabe
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.