Granted Patent
Utility
US 5,874,484 · App. 08/956,891
Use of polyol mixtures in rigid and semi-rigid polyurethane foams
Inventors:
Veerle Maria Rafaela Dirckx, Eric-Jack Gerard, Hans F. Vermeire
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Oct 23, 1997
Inventors
Veerle Maria Rafaela Dirckx
Eric-Jack Gerard
Hans F. Vermeire
Assignee (at issue)
SHELL OIL COMPANY
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.