Granted Patent
Utility
US 4,988,125 · App. 06/937,442
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Inventor:
George Calhoun
Patented Case
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Granted: Jan 29, 1991
Filed: Dec 4, 1986
Inventor
George Calhoun
Assignee (at issue)
Roadway Express, 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.