Granted Patent
Utility
US 5,169,560 · App. 07/583,884
Control of foam in hydrocarbon fluids
Inventor:
Paul R. Hart
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Sep 17, 1990
Inventor
Paul R. Hart
Assignee (at issue)
Betz Laboratories, 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.