Granted Patent
Utility
US 4,620,032 · App. 06/680,443
Depolymerization of condensation polymers involving a pre-molecular weight reduction step
Inventor:
Marvin L. Doerr
Patented Case
View Patent ↗
Granted: Oct 28, 1986
Filed: Dec 11, 1984
Inventor
Marvin L. Doerr
Assignee (at issue)
Celanese GmbH
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.