Granted Patent
Utility
US 4,310,617 · App. 06/174,478
Process for the production of masked positive color images by the silver dye bleach process
Inventors:
Herbert Mollet, Alfred Oetiker, Carlo Boragine
Patented Case
View Patent ↗
Granted: Jan 12, 1982
Filed: Aug 1, 1980
Inventors
Herbert Mollet
Alfred Oetiker
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.