Granted Patent
Utility
US 6,121,338 · App. 09/159,480
Process for rigid polyurethane foams
Inventor:
Luc Ferdinand Leon Colman
Patented Case
View Patent ↗
Granted: Sep 19, 2000
Filed: Sep 23, 1998
Inventor
Luc Ferdinand Leon Colman
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.