Process for the purification of hemin, a novel hemin derivative and a process for its preparation
CA 2062787 C · Owner: Huhtamaki Oy · Inventors: Toikka, Jarmo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the purification of hemin by dissolving raw hemin into 1,3dimethyl-2-imidazolidinone (DM1), the mixture is allowed to cool in order to crystallize the hemin in the form of a 1:3-adduct of hemin and DMI, whereafter the adduct obtained is split by mixing the same with warm water a lower alcohol or a mixture , thereof or by heating in a vacuum, and the liberated hemin is recovered. The invention also concerns a novel heroin derivative that is the 1:3-adduct of hemin and DM1 and a process for, its preparation.
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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 April 9, 1990 and granted February 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2012.
- 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
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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.