Granted Patent
Utility
US 4,749,191 · App. 07/013,601
Anti-slip step and method of manufacture
Inventors:
Carl L. Gipson, Kjell Pedersen, David Townsend
Patented Case
View Patent ↗
Granted: Jun 7, 1988
Filed: Feb 12, 1987
Inventors
Carl L. Gipson
Kjell Pedersen
David Townsend
Assignee (at issue)
Navistar International Transportation
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.