Granted Patent
Utility
US 5,340,909 · App. 07/809,353
Poly(1,3-propylene terephthalate)
Inventors:
Marvin L. Doerr, Joseph J. Hammer, J. R. Dees
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: Dec 18, 1991
Inventors
Marvin L. Doerr
Joseph J. Hammer
J. R. Dees
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.