Granted Patent
Utility
US 4,230,378 · App. 05/886,185
Resilient support pad for crawler type vehicles
Inventors:
Robert J. Purcell, James R. Sturges
Patented Case
View Patent ↗
Granted: Oct 28, 1980
Filed: Mar 13, 1978
Inventors
Robert J. Purcell
James R. Sturges
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.