Granted Patent
Utility
US 4,498,798 · App. 06/535,570
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Inventor:
Donald C. Day
Patented Case
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Granted: Feb 12, 1985
Filed: Sep 26, 1983
Inventor
Donald C. Day
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.