Granted Patent
Utility
US 4,477,013 · App. 06/529,925
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Inventor:
Melvin B. Herrin
Patented Case
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Granted: Oct 16, 1984
Filed: Sep 7, 1983
Inventor
Melvin B. Herrin
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.