Granted Patent
Utility
US 5,019,640 · App. 07/461,878
Producing a polyethylene terephthalate based polymer from a lower dialkyl ester of a dicarboxylic acid and a glycol
Inventors:
Monika Engel-Badar, Bobby N. Furr
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Jan 8, 1990
Inventors
Monika Engel-Badar
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.