Granted Patent
Utility
US 5,856,508 · App. 08/153,550
Fluorescent yellow 1,2,3,4-Tetrachloro-11H-Isoindolo-2,1-A!-Benzimidazol-11-one pigments
Inventors:
Edward E. Jaffe, Martin Tanner
Patented Case
View Patent ↗
Granted: Jan 5, 1999
Filed: Nov 16, 1993
Inventors
Edward E. Jaffe
Martin Tanner
Assignee (at issue)
Ciba Specialty Chemicals 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.