Granted Patent
Utility
US 5,692,227 · App. 08/221,789
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Inventors:
Hidetaka Yokota, Tetsuya Abe, Sachio Hasushita
Patented Case
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Granted: Nov 25, 1997
Filed: Apr 1, 1994
Inventors
Hidetaka Yokota
Tetsuya Abe
Sachio Hasushita
Assignee (at issue)
Asahi Kogaku Kogyo Kabushiki Kaisha
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.