Granted Patent
Utility
US 4,633,147 · App. 06/719,258
Electric powered vehicle and method of propelling the same
Inventors:
Bonne W. Posma, Rowland Hill
Patented Case
View Patent ↗
Granted: Dec 30, 1986
Filed: Apr 3, 1985
Inventors
Bonne W. Posma
Rowland Hill
Assignee (at issue)
National Mine Service 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.