Granted Patent
Utility
US 4,609,609 · App. 06/757,549
UV-absorbent compounds, process for their preparation and their use as image dyes in photographic materials for the silver dye bleach process
Inventors:
Thomas Rohr, Jakob Kuhn
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Jul 19, 1985
Inventors
Thomas Rohr
Jakob Kuhn
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.