Granted Patent
Utility
US 4,391,884 · App. 06/255,069
Process for the production of a photographic color image by the silver dye bleach process and suitable color photographic material therefor
Inventors:
Armin Meyer, Carlo Boragine
Patented Case
View Patent ↗
Granted: Jul 5, 1983
Filed: Apr 17, 1981
Inventors
Armin Meyer
Carlo Boragine
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.