Granted Patent
Utility
US 4,591,024 · App. 06/591,210
Lube oil ring pump
Inventor:
John W. Erickson
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Mar 19, 1984
Inventor
John W. Erickson
Assignee (at issue)
Dresser Industries, Inc.
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.