Granted Patent
Utility
US 4,359,931 · App. 06/225,941
Regenerative and anticavitation hydraulic system for an excavator
Inventors:
Gerard Martin Palmersheim, Robert Breeding
Patented Case
View Patent ↗
Granted: Nov 23, 1982
Filed: Jan 19, 1981
Inventors
Gerard Martin Palmersheim
Robert Breeding
Assignee (at issue)
Warner & Swasey
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.