Granted Patent
Utility
US 6,207,725 · App. 08/953,260
Rigid polyurethane foams
Inventors:
Thomas Heinrich Sieker, Franco Gabrieli
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Oct 17, 1997
Inventors
Thomas Heinrich Sieker
Franco Gabrieli
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.