Granted Patent
Utility
US 4,968,423 · App. 06/825,021
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Inventors:
Gary W. McKale, Anthony F. McGowan
Patented Case
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Granted: Nov 6, 1990
Filed: Jan 31, 1986
Inventors
Gary W. McKale
Anthony F. McGowan
Assignee (at issue)
The Duriron Company, Inc.
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.