Titanium dioxide, a process for its production and its use
CA 2003935 A1 · Owner: Kohler, Peter · Inventors: Thometzek, Peter; Verhoeven, Werner; Kohler, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A titanium dioxide composition useful as the opacifier agent for vitreous enamels and fusion enamels comprises TiO2 in an amount of at least 87% by weight a sulfate content, of 0.45% or less by weight based on TiO2 an alkali oxide content, of less than 0.5% by weight based on TiO2 a water content of, less than 12% by weight based on TiO2 a BET surface of 30 to, 500 m2/g, an apparent density of 0.2 to 0.8 kg/l a primary, particle size of 0.005 to 0.1 µm and a mean aggregated grain size of 30 to 500 µm and wherein the TiO2 is in amorphous form or the crystalline anatase form or a mixture of both and the, composition is prepared by adjusting an acidcontaining titanium dioxide hydrate to pH …
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 November 27, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2011.
- 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.