Granted Patent
Utility
US 5,336,788 · App. 08/151,653
Method of making oxydiphthalic anhydride
Inventor:
Viesturs Lesins
Patented Case
View Patent ↗
Granted: Aug 9, 1994
Filed: Nov 15, 1993
Inventor
Viesturs Lesins
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.