Granted Patent
Utility
US 4,870,194 · App. 07/160,036
Process for the preparation and recovery of oxdiphthalic anhydrides
Inventors:
John R. Molinaro, Joseph A. Pawlak, Willis T. Schwartz
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Feb 24, 1988
Inventors
John R. Molinaro
Joseph A. Pawlak
Willis T. Schwartz
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.