Expired Canadian patentCanada
Dye precursor from plants of the genus medicago, its preparation and its application in obtaining dyes
CA 2222358 C · Owner: Belcour-Castro, Beatrice · Inventors: Hussler, Georges; Bonnet, Anne; Belcour-Castro, Beatrice
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Dye precursors, present in the cells of plants of the genus Medicago such as alfalfa, are capable of reacting with quinones to produce colouring agents that can be used in dye compositions for textiles or hair.
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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 December 10, 1997 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 10, 1997
GrantedMarch 26, 2002
Term endedDecember 10, 2017
Patent numberCA 2222358 C
Classification (IPC)C12P17/10 +2 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.