Granted Patent
Utility
US 5,207,938 · App. 07/688,800
Method for retarding darkening of a dispersant-antioxidant olefin copolymer
Inventor:
Theodore E. Nalesnik
Patented Case
View Patent ↗
Granted: May 4, 1993
Filed: Apr 22, 1991
Inventor
Theodore E. Nalesnik
Assignee (at issue)
Texaco 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.