Granted Patent
Utility
US 4,760,144 · App. 06/929,867
Process for preparation of yellow shade modification of gamma quinacridone
Inventor:
Edward E. Jaffe
Patented Case
View Patent ↗
Granted: Jul 26, 1988
Filed: Nov 13, 1986
Inventor
Edward E. Jaffe
Assignee (at issue)
Ciba-Geigy
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.