Granted Patent
Utility
US 4,404,121 · App. 06/335,947
Process for preparing polyol-catalyst mixtures useful in the preparation of rigid polyurethane cellular products
Inventors:
Howard P. Klein, George P. Speranza
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Dec 30, 1981
Inventors
Howard P. Klein
George P. Speranza
Assignee (at issue)
Texaco Inc.
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.