Granted Patent
Utility
US 4,509,283 · App. 06/480,675
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Inventor:
M. Gaines Chesnut
Patented Case
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Granted: Apr 9, 1985
Filed: Mar 31, 1983
Inventor
M. Gaines Chesnut
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.