Granted Patent
Utility
US 5,073,552 · App. 07/576,849
Substituted benzophenone dicarboxylic acids
Inventors:
Mark W. Beltz, Venkataraman Ramachandran
Patented Case
View Patent ↗
Granted: Dec 17, 1991
Filed: Sep 4, 1990
Inventors
Mark W. Beltz
Venkataraman Ramachandran
Assignee (at issue)
Ethyl 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.