Granted Patent
Utility
US 4,526,972 · App. 06/624,894
Ultraviolet light stabilizing sterically hindered polyoxyalkylene amines
Inventors:
George P. Speranza, Robert A. Grigsby, Jr.
Patented Case
View Patent ↗
Granted: Jul 2, 1985
Filed: Jun 27, 1984
Inventors
George P. Speranza
Robert A. Grigsby, Jr.
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.