Granted Patent
Utility
US 4,481,988 · App. 06/551,021
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Inventors:
Gary E. Watson, James R. Doornek
Patented Case
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Granted: Nov 13, 1984
Filed: Nov 14, 1983
Inventors
Gary E. Watson
James R. Doornek
Assignee (at issue)
Douglas Dynamics, L.L.C.
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.