Granted Patent
Utility
US 4,228,248 · App. 06/011,352
Morpholine derivatives and use as polyurethane catalyst
Inventor:
Robert L. Zimmerman
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Feb 12, 1979
Inventor
Robert L. Zimmerman
Assignee (at issue)
Texaco Development Corporation
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.