Granted Patent
Utility
US 4,004,641 · App. 05/551,931
Motor grader drawbar assembly with safety clutch mechanism
Inventor:
Vergil P. Hendrickson
Patented Case
View Patent ↗
Granted: Jan 25, 1977
Filed: Feb 24, 1975
Inventor
Vergil P. Hendrickson
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.