Granted Patent
Utility
US 4,589,639 · App. 06/705,155
Centering device
Inventors:
Gary S. Peifer, Charles R. Russell
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Feb 25, 1985
Inventors
Gary S. Peifer
Charles R. Russell
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.