Compounds which release cyan dyes or dye forming materials
CA 1106363 A · Owner: Eastman Kodak Company · Inventors: Kilminster, Kenneth N.; Holstead, Colin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cyan azo dye-providing compounds have the formula:, wherein:, R1 18 selected from the group consisting of aryl alkyl or NR11R12 wherein R11 is alkyl or aryl and R12 is alkyl, or R11 and R12, taken together with the nitrogen atom to which they are attached, is a heterocyclic group; X is -CO- or -SO2-;, R3 is -COOH or -CAR and is attached in the meta or para position to X in the benzene ring; R is alkyl;, R2 is , or , or, can be taken together with R and the nitrogen atom to which it is attached to form a heterocyclic ring unsubstituted or substituted with a carboxy group; and, CAR is a carrier moiety which as a function of, oxidation under alkaline conditions releases a diffusible, dye, with …
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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 August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
- 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.