Granted Patent
Utility
US 4,853,758 · App. 07/084,531
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Inventor:
Frederick Harrison Fischer
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Aug 12, 1987
Inventor
Frederick Harrison Fischer
Assignee (at issue)
American Telephone and Telegraph Company, AT&T Bell Laboratories
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.