Granted Patent
Utility
US 4,324,435 · App. 06/245,229
Lock assembly for earthworking apparatus
Inventor:
Robert L. Fischer
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: May 8, 1980
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.