Process for the manufacture of anthraquinone compounds
CA 1102797 A · Owner: Ciba-Geigy Investments Ltd. · Inventors: Priester, Martin; Loew, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the manufacture of anthraquinone compounds of the formula I, (I), wherein R1 and R2 each independently represents hydrogen alkyl, or cycloalkyl, R3 represents hydrogen alkyl or aryl, X represents, R7 (where R7 is an aliphatic or aromatic residue) or (where R4 is alkylene or cycloalkylene and R5 and R6 each in-, dependently represents alkyl aryl or aralkyl), by reacting an, .alpha.-nitro-anthraquinone of the formula II (II), with an amine of the formula, to give 1-aminoanthraquinone (B) halogenating, preferably, brominating, the compound (B) to give 1-amino-4-halogeno- or 1-amino-2,4-dihalogeno-anthraquinone (C) condensing the compound, (C) with a diamine of the formula or …
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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 June 9, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 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.