Granted Patent
Utility
US 6,348,121 · App. 08/321,460
Polyurethane reaction system having a blocked catalyst combination
Inventors:
Thomas E. Schoener, Jeffrey B. Housenick
Patented Case
View Patent ↗
Granted: Feb 19, 2002
Filed: Oct 11, 1994
Inventors
Thomas E. Schoener
Jeffrey B. Housenick
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.