Basic dyes based on amides of j-acid (1-hydroxy-6- aminonaphthalene-3-sulfonic acid) and amides of j-acid
CA 2106830 A1 · Owner: Mayer, Udo · Inventors: Schloesser, Ulrike; Mayer, Udo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are described dyes of the formula, where, the ring A may be benzofused R1 is substituted or unsubstituted C1-C13-alkyl substi-, tuted or unsubstituted phenyl C1-C8-alkanoyl, substituted or unsubstituted benzoyl C2-C4-alkanoyl, substituted by a quaternizable or quaternary group or substituted diaminotriazinyl, R2 is hydrogen or C1-C4-alkyl or R1 and R2 together with the nitrogen atom joining them together are a heterocyclic radical, R3 and R4 are each substituted or unsubstituted C1-C13alkyl, substituted or unsubstituted C5-C7-cycloalkyl or substituted or unsubstituted piperidinyl and R3 may also be hydrogen, R5 is hydrogen C1-C4-alkyl C1-C4-alkoxy, C2-C3-alkan-, oylamino, halogen …
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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 September 23, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2015.
- 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
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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.