Granted Patent
Utility
US 4,242,467 · App. 06/047,847
Urea derivatives and use as polyurethane catalysts
Inventor:
Robert L. Zimmerman
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: Jun 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.