Granted Patent
Utility
US 4,355,821 · App. 06/159,914
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Inventor:
Kenneth Crawford
Patented Case
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Granted: Oct 26, 1982
Filed: Jun 16, 1980
Inventor
Kenneth Crawford
Assignee (at issue)
CRAWFORD INDUSTRIES LLC
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.