Granted Patent
Utility
US 4,234,743 · App. 06/039,868
Isomeric diaminobenzophenonedicarboxylic acids and method for preparing same
Inventors:
Johann G. D. Schulz, Anatoli Onopchenko, Edward T. Sabourin
Patented Case
View Patent ↗
Granted: Nov 18, 1980
Filed: May 17, 1979
Inventors
Johann G. D. Schulz
Anatoli Onopchenko
Edward T. Sabourin
Assignee (at issue)
GRDC, LLC
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.