Granted Patent
Utility
US 6,433,032 · App. 09/280,479
Process for rigid polyurethane foams
Inventor:
Alan J. Hamilton
Patented Case
View Patent ↗
Granted: Aug 13, 2002
Filed: Mar 30, 1999
Inventor
Alan J. Hamilton
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.