Granted Patent
Utility
US 4,338,408 · App. 06/284,900
Polyurethanes using bis(aminoethyl)ether derivatives as catalysts
Inventors:
Robert L. Zimmerman, Ernest L. Yeakey
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Jul 20, 1981
Inventors
Robert L. Zimmerman
Ernest L. Yeakey
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.