Granted Patent
Utility
US 5,244,044 · App. 07/895,000
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Inventor:
William David Henderson
Patented Case
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Granted: Sep 14, 1993
Filed: Jun 8, 1992
Inventor
William David Henderson
Assignee (at issue)
Otis Engineering 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.