Granted Patent
Utility
US 4,352,482 · App. 06/137,782
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Inventor:
Paul F. Duvall
Patented Case
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Granted: Oct 5, 1982
Filed: Apr 7, 1980
Inventor
Paul F. Duvall
Assignee (at issue)
Foseco Trading A.G.
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.