Granted Patent
Utility
US 5,209,521 · App. 07/894,176
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Inventor:
Roger Osborne
Patented Case
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Granted: May 11, 1993
Filed: Jun 3, 1992
Inventor
Roger Osborne
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.