Granted Patent
Utility
US 4,549,119 · App. 06/604,750
Control system and method for operating mining machine traction motors and the like
Inventor:
Richard M. Slagle
Patented Case
View Patent ↗
Granted: Oct 22, 1985
Filed: Apr 27, 1984
Inventor
Richard M. Slagle
Assignee (at issue)
Joy Manufacturing 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.