Platelet-like colored pigments and process for producing the same
CA 2132853 A1 · Owner: Franz, Klaus-Dieter · Inventors: Wilhelm, Stefan; Ambrosius, Klaus; Franz, Klaus-Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Colored pigments on the basis of platelet-like substrates containing TiO2, one or more suboxides of titanium and an oxide or oxides of one or more different metals and/or non metals whereby, the concentration of the titanium oxides in the coating layer is maximum in the proximity of the substrate surface and gradually decreases towards the pigment surface and the concentration of an oxide or oxides of one or more different metals and/or non metals is maximum at the pigment surface. The different metals and/or non metals are preferably Li, Na, K, Mg, Ca B, Al, Si, Zn and Fe in, an amount of from 1 to 50 % by weight relative to the amount of, titanium in the pigment.
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 March 16, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 2015.
- 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.