Granted Patent
Utility
US 4,880,845 · App. 07/277,873
Amino/ortho carboxylic acid ester catalyst system for isocyanate trimerization
Inventors:
Christopher T. Moss, Timothy A. Tufts, Robert S. Bock
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Nov 30, 1988
Inventors
Christopher T. Moss
Timothy A. Tufts
Robert S. Bock
Assignee (at issue)
Ashland Oil, 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.