Granted Patent
Utility
US 4,943,642 · App. 07/352,070
Halo-oxydiphthalic anhydrides
Inventors:
Jeffrey S. Stults, Willis T. Schwartz
Patented Case
View Patent ↗
Granted: Jul 24, 1990
Filed: May 15, 1989
Inventors
Jeffrey S. Stults
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.