Granted Patent
Utility
US 4,439,549 · App. 06/443,727
Novel aromatic polyester polyol mixtures made from polyethylene terephthalate residues and alkylene oxides
Inventor:
Michael E. Brennan
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Nov 22, 1982
Inventor
Michael E. Brennan
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.