Method for processing silver dye bleach materials
CA 1058939 A · Owner: Ciba-Geigy Ag · Inventors: Marthaler, Max
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a new method for processing silver dye bleach material. The process measures of this method consisting of (1) silver developing, (2) dye bleaching (3), silver bleaching, (4) silver fixing are carried out in the sequence (1) to (4) with appropriate preparations. The silver bleaching (3) preparation contains (a) a strong acid (b) a, water-soluble iodide, (c) a water-soluble oxidising agent (d) a diazine compound and (e) an anti-oxidant. An excellent and rapid bleaching is achieved.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 24, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 24, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.