Liquid medium extraction purification method
CA 2225798 C · Owner: Takhim, Mohamed · Inventors: Takhim, Mohamed
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the extraction purification of at least one substance to be isolated from a liquid medium comprising the steps of adding to the liquid medium a vapour-entrainable organic compound having a Lewis-type acid-base molecule where at least one N O and/or S atom forms one or more active sites provided with a free electron pair in resonance with at least one other pair on the molecule said compound being added in a sufficient amount to produce a reaction product from a balanced reaction between the organic compound and said substance(s) to be isolated and to precipitate the balanced reaction product filtering the precipitate, vapour-entraining organic compound therefrom and collecting …
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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 June 21, 1996 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 21, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 2018.
- 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.