Granted Patent
Utility
US 4,615,448 · App. 06/781,291
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Inventor:
George S. Johnstonbaugh
Patented Case
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Granted: Oct 7, 1986
Filed: Sep 27, 1985
Inventor
George S. Johnstonbaugh
Assignee (at issue)
Masonite Corporation
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.