Granted Patent
Utility
US 4,911,615 · App. 07/301,155
Hydraulic pump unloader
Inventor:
Michael McCullagh
Patented Case
View Patent ↗
Granted: Mar 27, 1990
Filed: Jan 24, 1989
Inventor
Michael McCullagh
Assignee (at issue)
Clayton Dewandre Co., Ltd.
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.