Granted Patent
Utility
US 4,974,297 · App. 07/434,430
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Inventor:
Shunji Akashi
Patented Case
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Granted: Dec 4, 1990
Filed: Nov 13, 1989
Inventor
Shunji Akashi
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.