Granted Patent
Utility
US 4,278,295 · App. 06/145,065
Impacting rock breaker
Inventor:
Delwin E. Cobb
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Dec 13, 1979
Inventor
Delwin E. Cobb
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.