Granted Patent
Utility
US 5,159,872 · App. 07/682,986
Valve units for use in hydraulic control systems of mining equipment
Inventors:
Michael Dettmers, Bernd Peters
Patented Case
View Patent ↗
Granted: Nov 3, 1992
Filed: Apr 10, 1991
Inventors
Michael Dettmers
Bernd Peters
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.