Mixed crystals of laked azo dyes
CA 1303026 C · Owner: Grubenmann, Arnold · Inventors: Hari, Stefan; Grubenmann, Arnold; Burkhard, Andreas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-16117/+, Mixed crystals of laked azo dyes ABSTRACT OF THE DISCLOSURE, Mixed crystals of at least two different compounds of formula I, (I), wherein, R is -CH3, phenyl -COOCH3, -COOCH3, -COOC2H5, -NHCO-C1-C4 alkyl or -CONH-C1-C4 alkyl M+ and, M1+ are each independently of the other an alkali metal cation, an alkaline earth metal cation or a heavy metal cation or NH4+; wherein X, Y, X' and Y' are each independently hydrogen, halogen, -CH3, -C2H5 -OCH3, -OC2H5, -NO2 or the group of formula -NHCO-C1-C4 alkyl, wherein at least two of the cations M+ and M1+ in the compounds forming the mixed crystals of formula I are different and the X-ray diffraction patterns of the mixed crystals differ from …
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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, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 2009.
- 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.