Granted Patent
Utility
US 4,327,599 · App. 06/173,928
Blocking mechanism
Inventor:
Patrick W. Friede
Patented Case
View Patent ↗
Granted: May 4, 1982
Filed: Feb 28, 1980
Inventor
Patrick W. Friede
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.