Granted Patent
Utility
US 4,879,164 · App. 07/185,648
Laminated composite of a rigid polyisocyanurate substrate and metal, plastic, cellulose, glass, ceramic or combinations thereof
Inventor:
Usama E. Younes
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: Apr 25, 1988
Inventor
Usama E. Younes
Assignee (at issue)
Arco Chemical Technology, L.P.
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.