Granted Patent
Utility
US 4,370,895 · App. 06/098,823
Friction drive wheels
Inventor:
David M. Wright
Patented Case
View Patent ↗
Granted: Feb 1, 1983
Filed: Nov 30, 1979
Inventor
David M. Wright
Assignee (at issue)
British Gas
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.