Pigments having improved colouristic properties and process for their preparation
CA 2374977 A1 · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Ruf, Klaus; Grandidier, Yves; Deno, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for preparing pigments which comprises: , subjecting a crude pigment or mixture of crude pigments and a crystalline inorganic salt of mixture of crystalline inorganic salts together essentially , in the absence of other constituents to the action of a rotor having a , tangential speed of at least 10 m/s so that a temperature of at least 80~C is attained by means of friction effects; and subsequently kneading the product of this treatment with an organic liquid during which it is possible if , desired to add additional substances selected from the group consisting of inorganic salts, inert additives and colorants. These pigments and their use in …
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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
- Filed June 23, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 23, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2022.
- 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.