Negative photographic silver dye bleach material
CA 1259516 A · Owner: Ciba-Geigy Ag · Inventors: Boragine, Carlo; Schaller, Heinrich; Marthaler, Max H. (Deceased)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Negative photographic silver dye bleach material. Abstract Negative photographic silver dye bleach material which contains on a support (a) a layer containing an image dye a low sensitive, silver halide emulsion and colloidal nuclei onto which silver deposition may occur, and (b) a layer containing a highly sensitive iodide-containing silver halide emulsion. The material has increased sensitivity and yields photographic images of high quality by means of iodide ion diffusion.
Read the whole patent
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 September 19, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 19, 2006.
- 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.