Granted Patent
Utility
US 4,994,621 · App. 07/338,664
Aminated, alkoxylated hydroxyl-terminated polybutadienes
Inventors:
Ernest L. Yeakey, Robert L. Zimmerman, Michael Cuscurida
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Apr 17, 1989
Inventors
Ernest L. Yeakey
Robert L. Zimmerman
Michael Cuscurida
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.