Granted Patent
Utility
US 4,257,621 · App. 06/010,339
Vehicle hitch and drawbar assembly
Inventors:
Carl P. Adams, Robert D. Roley
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Feb 8, 1979
Inventors
Carl P. Adams
Robert D. Roley
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.