Granted Patent
Utility
US 4,382,412 · App. 06/164,428
Dual drive traction system
Inventor:
Donald P. Sullivan
Patented Case
View Patent ↗
Granted: May 10, 1983
Filed: Jun 30, 1980
Inventor
Donald P. Sullivan
Assignee (at issue)
Universal Mobility, 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.