Granted Patent
Utility
US 4,665,639 · App. 06/835,941
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Inventor:
Jacob Fast
Patented Case
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Granted: May 19, 1987
Filed: Mar 4, 1986
Inventor
Jacob Fast
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.