Granted Patent
Utility
US 4,447,798 · App. 06/240,142
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Inventor:
Ira P. Shapiro
Patented Case
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Granted: May 8, 1984
Filed: Mar 3, 1981
Inventor
Ira P. Shapiro
Assignee (at issue)
Burroughs, Inc.
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.