Method for preparing 3'- aminopropyl-2-sulphatoethylsulphone
CA 2077673 A1 · Owner: Angenendt, Heinrich · Inventors: Meier, Michael; Angenendt, Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
57) Abstract, In a method for preparing 3'-aminopropyl-2-sulphatoethylsulphone in a one-pot process allyl amine is reacted with mercaptoethanol in dilate sulphuric acid at temperatures of approximately 50 °C up so the boiling point in the presence of a radical starter. The resultant reaction mixture is oxidized with hydrogen peroxide in the presence of catalytic quantities of a compound of a transition metal of the periodic system or the elements as an oxidation catalyst at temperatures of approximately 70 to 100 °C and evaporated to dryness after addition or sufficient sulphuric acid to bring the total sulphuric acid content of the mixture to at least 1 mol, referred to the quantity or …
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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 February 27, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2013.
- 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.