Azo dyestuffs
CA 1072083 A · Owner: Sandoz Ltd. · Inventors: Dore, Jacky
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 pure asymmetric 1:2 cobalt complexes and mixtures thereof, I in which X is hydrogen or nitro, either R1 and R2, independently, are hydrogen (C1-4)-, alkyl, (C1-4) alkoxy, chlorine bromine or nitro, or R1 is hydrogen, chlorine or nitro and, R2 is -SO2NR3R4, in which the groups R1 and R2 occupy the 4- and 5-positions, either R3 is hydrogen unsubstituted or substituted, (C1-4) alkyl and, R4 is hydrogen, unsubstituted or substituted (C1-4) alkyl, (C5-7) cycloalkyl or phenyl or , R3 and R4, together with the nitrogen atom to which they are bound, form a non-aromatic 5- or 6- membered heterocyclic ring which contains one or two hetero atoms, B is a divalent …
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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 February 19, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 1997.
- 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.