Granted Patent
Utility
US 5,116,938 · App. 07/557,831
Process for producing the polyester polyethylene terephthalate (PET) from a lower dialkyl ester of a dicarboxylic acid and a glycol using a specific catalyst system
Inventors:
Monika Engel-Bader, Bobby N. Furr
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Jul 26, 1990
Inventors
Monika Engel-Bader
Bobby N. Furr
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.