Granted Patent
Utility
US 5,447,921 · App. 08/409,400
Catalyst system for adherent rigid foam
Inventors:
Keith A. Borden, David Scott Jensen, Robert E. Anderson
Patented Case
View Patent ↗
Granted: Sep 5, 1995
Filed: Mar 24, 1995
Inventors
Keith A. Borden
David Scott Jensen
Robert E. Anderson
Assignee (at issue)
Aristech Chemical 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.