Process for the preparation of heme/hemin
CA 2029388 A1 · Owner: Provivo Oy · Inventors: Tiainen, Eija T.; Mansson, Kristina M. V.; Lundell, Ralf O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the preparation of heme and/or hemin by extraction using a solvent of heme/hemin containing material, such as blood haemoglobin, or heme/-, hemin sources, wherein one utilizes as a solvent, a solvent, which has a considerably greater solubility to heme/hemin at an elevated temperature than at a lower temperature and which, solvent is liquid at the extraction and crystallization temperatures, and that the extraction is carried out at an acid or neutral pH, whereby preferably lower alkyl esters of formic acid, acetic acid, acetoacetic acid, 2-hydroxypropionic acid 2-oxopropionic acid, malonic acid, maleic acid malic acid and, fumaric acid are …
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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 November 6, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 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
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.