Granted Patent
Utility
US 6,372,811 · App. 09/122,132
Flame resistant rigid polyurethane foams blown with hydrofluorocarbons
Inventors:
Sachchida N. Singh, Steve Burns, Patricia A. Jones
Patented Case
View Patent ↗
Granted: Apr 16, 2002
Filed: Jul 24, 1998
Inventors
Sachchida N. Singh
Steve Burns
Patricia A. Jones
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.