Granted Patent
Utility
US 6,244,608 · App. 09/405,454
Ramp-accommodating movable subframe for a semi-trailer
Inventor:
Timothy Hess
Patented Case
View Patent ↗
Granted: Jun 12, 2001
Filed: Sep 24, 1999
Inventor
Timothy Hess
Assignee (at issue)
The Boler Company
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.