Granted Patent
Utility
US 5,007,144 · App. 07/502,733
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Inventors:
Yasuharu Terada, Susumu Ishii
Patented Case
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Granted: Apr 16, 1991
Filed: Apr 2, 1990
Inventors
Yasuharu Terada
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.