Granted Patent
Utility
US 4,928,358 · App. 07/307,959
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Inventors:
Susumu Ishii, Hideyuki Matsushima
Patented Case
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Granted: May 29, 1990
Filed: Feb 9, 1989
Inventors
Susumu Ishii
Hideyuki Matsushima
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.