Granted Patent
Utility
US 4,266,798 · App. 06/011,990
Push-pull coupling for power scrapers
Inventor:
Roger M. Smith
Patented Case
View Patent ↗
Granted: May 12, 1981
Filed: Feb 14, 1979
Inventor
Roger M. Smith
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.