Expired Canadian patentCanada
Pure-coloured, readily dispersible iron oxide red pigments with high grinding stability
CA 2507331 C · Owner: Rosenhahn, Carsten · Inventors: Burow, Wilfried; Rosenhahn, Carsten; Schneider, Volker
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to pure-coloured readily dispersible iron oxide red pigments having high grinding stability to a process for preparing them, and to their use.
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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
- Filed May 13, 2005 and granted September 4, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 13, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 13, 2005
GrantedSeptember 4, 2012
Term endedMay 13, 2025
Patent numberCA 2507331 C
Classification (IPC)C01G49/02 +1 more
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.