Granted Patent
Utility
US 4,819,989 · App. 07/067,692
Propulsion systems for mineral mining machines
Inventor:
Herbert Kleine
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jun 29, 1987
Inventor
Herbert Kleine
Assignee (at issue)
Gewerkschaft Eisenhutte Westfalia GmbH
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.