Granted Patent
Utility
US 4,296,642 · App. 06/067,932
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Inventor:
Thomas Schetter
Patented Case
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Granted: Oct 27, 1981
Filed: Aug 20, 1979
Inventor
Thomas Schetter
Assignee (at issue)
DANA LIMITED
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.