Granted Patent
Utility
US 4,941,968 · App. 07/387,329
Method for inhibiting gum formation in liquid hydrocarbon mediums
Inventor:
Dwight K. Reid
Patented Case
View Patent ↗
Granted: Jul 17, 1990
Filed: Jul 28, 1989
Inventor
Dwight K. Reid
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.