Granted Patent
Utility
US 4,452,922 · App. 06/468,430
Polyamide co-polymer polyols made with diesters and diamines and polyurethanes therefrom
Inventors:
George P. Speranza, Robert L. Zimmerman
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Feb 22, 1983
Inventors
George P. Speranza
Robert L. Zimmerman
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.