Separation and purification of pigment suspensions and suspensions of pigment intermediates by a membrane separation process
CA 1292222 C · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Flierl, Klaus; Pfenninger, Heinz; Marfurt, Hans-Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Separation and purification of pigment suspensions and suspensions of pigment intermediates by a membrane separation process Abstract the Disclosure, Process for separating and purifying pigment suspensions and suspensions of pigment intermediates in a liquid by means of a membrane separation process, whereby the suspension to be treated is uniformly fed to and circulated through a microfiltration unit containing at least one semi-permeable membrane and the separated liquid flows off through the membrane as permeate which process, comprises replacing the permeate gradually by a washing liquid that differs from the first liquid such that the total amount of washing liquid fed into the system …
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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 November 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 19, 2008.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.