Granted Patent
Utility
US 4,246,364 · App. 06/122,029
Process for polyisocyanurate foams based on an amide-diol blend
Inventors:
Charles E. Koehler, Thomas R. McClellan, Pat L. Murray
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Feb 19, 1980
Inventors
Charles E. Koehler
Thomas R. McClellan
Pat L. Murray
Assignee (at issue)
The Upjohn Co.
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.