Granted Patent
Utility
US 6,257,608 · App. 09/352,600
Apparatus for propelling a wheel chair
Inventor:
Thomas W. Hanson
Patented Case
View Patent ↗
Granted: Jul 10, 2001
Filed: Jul 13, 1999
Inventor
Thomas W. Hanson
Assignee (at issue)
HILL-ROM, INC.
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.