Granted Patent
Utility
US 4,247,655 · App. 06/076,626
Rigid and semiflexible polyurethane foams produced with phenol-aldehyde-amine resins
Inventors:
Raymond A. Dunleavy, James A. McClanahan
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Sep 18, 1979
Inventors
Raymond A. Dunleavy
James A. McClanahan
Assignee (at issue)
Union Carbide 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.