Granted Patent
Utility
US 5,171,421 · App. 07/756,819
Method for controlling fouling deposit formation in a liquid hydrocarbonaceous medium
Inventor:
David R. Forester
Patented Case
View Patent ↗
Granted: Dec 15, 1992
Filed: Sep 9, 1991
Inventor
David R. Forester
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.