Granted Patent
Utility
US 4,376,832 · App. 06/328,291
Catalyst-solvent system for polyester-based polyurethane foams comprising N-butylmorpholine and N,N'-dimethylpiperazine and the solvent
Inventors:
George P. Speranza, Robert L. Zimmerman
Patented Case
View Patent ↗
Granted: Mar 15, 1983
Filed: Dec 7, 1981
Inventors
George P. Speranza
Robert L. Zimmerman
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.