Mixture of dyes for cyan dye donor for thermal color proofing
CA 2053529 A1 · Owner: Evans, Steven · Inventors: Chapman, Derek D.; Evans, Steven; Evans, Steven
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A cyan dye-donor element for thermal dye transfer comprising a support having thereon a dye layer comprising a mixture of cyan dyes dispersed in a polymeric binder, at least one of the cyan dyes having the formula:, wherein: R1 and R2 each independently represents hydrogen; a substituted or unsubstituted alkyl group having from 1 to about 6 carbon atoms; a substituted or unsubstituted, cycloalkyl group having from about 5 to about 7 carbon atoms or a substituted or, unsubstituted allyl group; or R1 and R2 can be joined together to form, along with the nitrogen to which they are attached, a 5- to 7-membered heterocyclic ring;, or either or both of R1 and R2 can be …
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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
- Filed October 16, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 2013.
- 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.