Granted Patent
Utility
US 5,064,873 · App. 07/342,508
"Rigid foam with improved ""k"" factor by reacting a polyisocyanate prepolymer and polyester polyol containing low free glycol"
Inventors:
Scott C. Snider, Michael E. Londrigan, Kenneth G. Trout
Patented Case
View Patent ↗
Granted: Nov 12, 1991
Filed: Apr 24, 1989
Inventors
Scott C. Snider
Michael E. Londrigan
Kenneth G. Trout
Assignee (at issue)
Jim Walter Research Corp.
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.