Granted Patent
Utility
US 4,862,819 · App. 07/174,041
Wheel drive
Inventor:
Derek James Fawcett
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: Mar 28, 1988
Inventor
Derek James Fawcett
Assignee (at issue)
Nautech Limited
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.