Process and furnace for the production of tio2 pigment according to the sulfate process
CA 2320951 A1 · Owner: Kerr-Mcgee Pigments Gmbh & Co. Kg · Inventors: Lailach, Gunter; Kempkens, Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method for the production of TiO2 pigments by dissolving titanium raw materials with sulfuric acid, producing a metal sulfate-containing titanyl sulfate solution, hydrolysing the titanyl sulfate separation of the titanium , dioxide hydrate from the metal sulfate-containing sulfuric acid by filtration optional bleaching the titanium dioxide hydrate by reducing treatment in acidic solution, mixing the titanium dioxide hydrate with doping chemicals and calcining the titanium dioxide hydrate to TiO2 pigment characterized in , that titanium dioxide hydrate is used as a starting material for the TiO2 calcining which has less than 3 kg sulfate ions per t TiO2 after a treatment with alkali …
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 February 16, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 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.