Granted Patent
Utility
US 4,995,458 · App. 07/434,345
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Inventor:
Keith Garbett
Patented Case
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Granted: Feb 26, 1991
Filed: Nov 9, 1989
Inventor
Keith Garbett
Assignee (at issue)
Cooper Industries Holdings
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.