Granted Patent
Utility
US 4,824,641 · App. 06/877,026
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Inventor:
Fred G. Williams
Patented Case
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Granted: Apr 25, 1989
Filed: Jun 20, 1986
Inventor
Fred G. Williams
Assignee (at issue)
Cetus 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.