Granted Patent
Utility
US 4,881,371 · App. 07/224,165
Auxiliary coupler pressure relief hydraulic system with pump drive ignition switch relief
Inventors:
Thomas Q. Haeder, William C. Shelbourn
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Jul 26, 1988
Inventors
Thomas Q. Haeder
William C. Shelbourn
Assignee (at issue)
CLARK EQUIPMENT 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.