Granted Patent
Utility
US 4,711,912 · App. 06/372,904
Polyisocyanurate foams from digestion products of polyalkylene terephthalate polymers and polyols
Inventors:
Scott C. Snider, Alberto DeLeon
Patented Case
View Patent ↗
Granted: Dec 8, 1987
Filed: Apr 29, 1982
Inventors
Scott C. Snider
Alberto DeLeon
Assignee (at issue)
Celotex Corporation
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.