Granted Patent
Utility
US 4,715,789 · App. 06/839,977
High speed hydraulic fluid venting valve in a hydraulic fluid pump
Inventors:
Reinald D. Liegel, James G. Ballard
Patented Case
View Patent ↗
Granted: Dec 29, 1987
Filed: Mar 17, 1986
Inventors
Reinald D. Liegel
James G. Ballard
Assignee (at issue)
Hein-Werner 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.