Granted Patent
Utility
US 4,767,881 · App. 07/072,314
Synthesis of diphenyl phthlates
Inventor:
A. Lee Stautzenberger
Patented Case
View Patent ↗
Granted: Aug 30, 1988
Filed: Jul 13, 1987
Inventor
A. Lee Stautzenberger
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.