Granted Patent
Utility
US 3,972,431 · App. 05/552,381
Grapple unit for logging vehicles
Inventor:
Robert L. Fischer
Patented Case
View Patent ↗
Granted: Aug 3, 1976
Filed: Feb 24, 1975
Inventor
Robert L. Fischer
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.