Granted Patent
Utility
US 4,074,896 · App. 05/671,640
Cushion compression struts for bulldozer blades
Inventor:
Larry G. Eftefield
Patented Case
View Patent ↗
Granted: Feb 21, 1978
Filed: Mar 29, 1976
Inventor
Larry G. Eftefield
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.