Granted Patent
Utility
US 4,699,970 · App. 06/880,477
Resin from phenolic and oxazoline using phosphorous acid ester as catalyst
Inventors:
Omar Tiba, Billy M. Culbertson
Patented Case
View Patent ↗
Granted: Oct 13, 1987
Filed: Jun 30, 1986
Inventors
Omar Tiba
Billy M. Culbertson
Assignee (at issue)
Ashland Oil, 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.