Granted Patent
Utility
US 4,263,535 · App. 05/947,259
Motor drive system for an electric mining shovel
Inventor:
Byron Jones
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: Sep 29, 1978
Inventor
Byron Jones
Assignee (at issue)
Bucyrus Erie 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.