Granted Patent
Utility
US 4,245,716 · App. 06/058,392
Vehicle access ladder
Inventor:
James F. Rayfield
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Jul 17, 1979
Inventor
James F. Rayfield
Assignee (at issue)
Sperry Corp.
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.