Granted Patent
Utility
US 6,528,549 · App. 10/090,783
Rigid polyurethane foams
Inventors:
Thomas Heinrich Sieker, Franco Gabrieli, Saskia Rachel Walraedt
Patented Case
View Patent ↗
Granted: Mar 4, 2003
Filed: Mar 6, 2002
Inventors
Thomas Heinrich Sieker
Franco Gabrieli
Saskia Rachel Walraedt
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.