Oxidation resistant, heat resistant iron oxide black pigments, a process for their preparation and their use
CA 1331675 C · Owner: Bayer Aktiengesellschaft · Inventors: Burow, Wilfried; Schulten, Gerd-Hermann; Kiemle, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
New Oxidation Resistant, Heat Resistant Iron Oxide Black Pigments, a Process for their Preparation and their Use ABSTRACT OF THE DISCLOSURE, Isometric oxidation resistant and heat resistant iron oxide black pigments having a foreign metal content of less than 5 ppm of each of As, Pb and Ba, less than 200 ppm total of Ca, BaSO4, Zn, Sb and Cr and from 0.05 to 2% by weight calculated, as trivalent or tetra-valent oxides of B, Al, Ga, Si, Ge and, Sn, are useful in coloring lacqueres thermoplastic synthetic, resins and building materials as well as for low coercivity iron oxide black pigments in magnetic toners.
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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 August 30, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 30, 2011.
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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.