Production of pigments
CA 2261497 A1 · Owner: Chattopadhyay, Arun Kumar · Inventors: Barry, Thomas Aquinas; Chattopadhyay, Arun Kumar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Metal pigment, especially aluminium pigment is produced in a non toxic environment by milling and/or blending in an inert medium comprising transesterified alkyl, especially methyl esters of vegetable oils selected from, soybean oil, cotton seed oil and linseed oil. The metallic pigments produced are, of improved quality and appearance. They have improved brightness and the non-leafing pigments produced have highly leafing characteristics.
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 11, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 11, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 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.