Granted Patent
Utility
US 5,153,335 · App. 07/790,839
Process for the preparation of oxydiphthalic anhydride and acyloxyphthalic anhydrides
Inventor:
Jeffrey S. Stults
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Nov 12, 1991
Inventor
Jeffrey S. Stults
Assignee (at issue)
Occidental Chemical 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.