Granted Patent
Utility
US 4,789,689 · App. 07/113,854
Amine catalyst for urethanes
Inventors:
Robert L. Zimmerman, Terry L. Renken
Patented Case
View Patent ↗
Granted: Dec 6, 1988
Filed: Oct 29, 1987
Inventors
Robert L. Zimmerman
Terry L. Renken
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.