Production process of copper phthalocyanine in the beta modification
CA 2328735 A1 · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Mathers, Richard Ernest; Dykes, Kenneth Grant; Healy, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for the production of pigmentary copper phthalocyanine in the beta crystalline phase comprising: a) dry or aqueous milling of crude copper phthalocyanine in combination with a natural or chemically modified resin and, optionally a grinding auxiliary followed , by; b) isolation of the milled mass followed by; c) conditioning treatment of the milled mass.
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
- Filed April 19, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 19, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 19, 2021.
- 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.