Granted Patent
Utility
US 5,082,731 · App. 07/645,431
Producing a copolyester from a lower dialkyl ester of terephthalic acid, a glycol and a dicarboxylic acid
Inventors:
Anthony W. Cooke, Monika E. Bader
Patented Case
View Patent ↗
Granted: Jan 21, 1992
Filed: Jan 24, 1991
Inventors
Anthony W. Cooke
Monika E. Bader
Assignee (at issue)
Hoechst Celanese 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.