Granted Patent
Utility
US 4,940,770 · App. 07/270,897
Novel compositions from polyoxyalkylene amines and epoxides
Inventors:
George P. Speranza, Jiang-Jen Lin
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Nov 14, 1988
Inventors
George P. Speranza
Jiang-Jen Lin
Assignee (at issue)
Texaco Chemical 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.