Granted Patent
Utility
US 6,534,555 · App. 09/950,133
Catalyst systems for polyurethane polyester foams
Inventors:
Ernest L. Rister, Jr., Robert A. Grigsby, Jr., Robert L. Zimmerman
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Sep 10, 2001
Inventors
Ernest L. Rister, Jr.
Robert A. Grigsby, Jr.
Robert L. Zimmerman
Assignee (at issue)
HUNTSMAN PETROCHEMICAL LLC
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.