Granted Patent
Utility
US 4,469,824 · App. 06/553,272
Liquid terephthalic ester polyols and polyisocyanurate foams therefrom
Inventors:
Robert A. Grigsby, Jr., George P. Speranza, Michael E. Brennan
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Nov 18, 1983
Inventors
Robert A. Grigsby, Jr.
George P. Speranza
Michael E. Brennan
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.