Granted Patent
Utility
US 4,216,973 · App. 06/010,338
Seal
Inventor:
Orville E. Kessinger, Jr.
Patented Case
View Patent ↗
Granted: Aug 12, 1980
Filed: Feb 8, 1979
Inventor
Orville E. Kessinger, Jr.
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.