Granted Patent
Utility
US 4,469,823 · App. 06/518,171
Flexible polyurethane foams made using an aromatic polyester polyol
Inventors:
Ernest L. Yeakey, Robert L. Zimmerman, Michael E. Brennan
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Jul 28, 1983
Inventors
Ernest L. Yeakey
Robert L. Zimmerman
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.