Granted Patent
Utility
US 4,274,682 · App. 06/048,899
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Inventor:
Richard E. Livesay
Patented Case
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Granted: Jun 23, 1981
Filed: Jun 15, 1979
Inventor
Richard E. Livesay
Assignee (at issue)
Caterpillar Tractor Co.
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.