Granted Patent
Utility
US 4,285,639 · App. 06/047,853
Electronic control for variable displacement pumps
Inventors:
Richard H. Woodring, Paul K. Houtman, Thomas Kowalski, Charles H. Whitmore
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Jun 12, 1979
Inventors
Richard H. Woodring
Paul K. Houtman
Thomas Kowalski
Charles H. Whitmore
Assignee (at issue)
Parker-Hannifin Corporation
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.