Granted Patent
Utility
US 5,849,864 · App. 08/686,845
Sulfonic acid blocked metal catalysts for amine trigger urethane reactions
Inventors:
Gary M. Carlson, Laurence G. Dammann
Patented Case
View Patent ↗
Granted: Dec 15, 1998
Filed: Aug 1, 1996
Inventors
Gary M. Carlson
Laurence G. Dammann
Assignee (at issue)
Ashland Chemical, 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.