Granted Patent
Utility
US 4,771,807 · App. 07/068,496
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Inventor:
Hans Karani
Patented Case
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Granted: Sep 20, 1988
Filed: Jul 1, 1987
Inventor
Hans Karani
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.