Granted Patent
Utility
US 4,485,194 · App. 06/542,803
Extraction of polyoxyalkylene surfactants for phenolic foam stabilization
Inventors:
Richard L. Frentzel, Ernest K. Moss
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Oct 17, 1983
Inventors
Richard L. Frentzel
Ernest K. Moss
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.