Granted Patent
Utility
US 5,085,555 · App. 07/554,705
Spring biased vehicle access ramp
Inventor:
Roger Vartanian
Patented Case
View Patent ↗
Granted: Feb 4, 1992
Filed: Jul 18, 1990
Inventor
Roger Vartanian
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.