Granted Patent
Utility
US 5,340,910 · App. 08/079,416
Process for preparing 1-cyano-3H-dibenz[f,ij]isoquinoline-2,7-diones and their use as toners for polyesters
Inventors:
Kim S. Chamberlin, Wayne P. Pruett, Max A. Weaver, Samuel D. Hilbert, Donna Rice Quillen, Preston K. Salyer
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: Jun 21, 1993
Inventors
Kim S. Chamberlin
Wayne P. Pruett
Max A. Weaver
Samuel D. Hilbert
Donna Rice Quillen
Preston K. Salyer
Assignee (at issue)
Eastman Chemical Company
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.