Methine-azo compounds
CA 1261822 A · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Mockli, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methine-azo compounds, Abstract, Methine-azo compounds of the formula X?, in which, A is the complement to a heterocyclic 5- or 6-membered ring which has a quaternised N atom as a ring member which can contain further hetero atoms and which can be substituted or/and be fused with carbocyclic or heterocyclic rings, R is hydrogen, cyano or C2-C3-alkylene which is bonded to an N atom of ring A to form a 5- or 6-membered ring, B is substituted or unsubstituted phenylene or naphthylene, X? is an anion and, KK is the radical of an open-chain coupling component which contains active methylene groups except that, if A is the complement to a pyridinium ring KK, cannot be the radical of …
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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 September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 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.