Granted Patent
Utility
US 4,881,603 · App. 07/286,255
Tow frame
Inventor:
LeRoy Hartman
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Dec 19, 1988
Inventor
LeRoy Hartman
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.