Granted Patent
Utility
US 4,250,766 · App. 06/006,820
Shaft puller
Inventors:
David J. Balzer, James D. Sickinger
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Jan 26, 1979
Inventors
David J. Balzer
James D. Sickinger
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.