Granted Patent
Utility
US 5,778,798 · App. 08/393,817
Lift axle suspension for large volume trailers
Inventor:
Ervin K. VanDenberg
Patented Case
View Patent ↗
Granted: Jul 14, 1998
Filed: Feb 24, 1995
Inventor
Ervin K. VanDenberg
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.