Granted Patent
Utility
US 4,976,015 · App. 07/429,610
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Inventor:
Susumu Ishii
Patented Case
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Granted: Dec 11, 1990
Filed: Oct 31, 1989
Inventor
Susumu Ishii
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.