Organic compounds
CA 1248941 A · Owner: Sandoz Ltd. · Inventors: Oppliger, Max; Eichenberger, Herbert; Baumann, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A monoazo or disazo compound in metal-free form or in 1:1 or 1:2 metal complex form which in the metal-free form corresponds to formula I, CH2=CH-SO2-W1-D - N = N - K-(W2-Z)n I in which, D is the radical of a diazo component K is the radical of a coupling component W1 is a direct bond or a divalent bridging group W2 is a divalent bridging group, n is an integer 1 to 4 Z is a water solubilising protonable amine group a quaternary, ammonium group, a hydrazinium group or a ternary sulphonium group, which compound is in free basic salt form or acid addition salt form, formed by the addition of dilute aqueous organic or mineral acids can be used for dyeing or printing …
Read the whole patent
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 January 17, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 17, 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.