Granted Patent
Utility
US 4,229,044 · App. 06/031,560
Clevis-mounted impact ripper
Inventors:
Delwin E. Cobb, Richard E. Livesay
Patented Case
View Patent ↗
Granted: Oct 21, 1980
Filed: Feb 12, 1979
Inventors
Delwin E. Cobb
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.