Process for the production of the form i of the terazosin monohydrochloride anhydrous
CA 2219617 A1 · Owner: Galbiati, Barbara · Inventors: Galbiati, Barbara; Cannata, Vincenzo; Ferrario, Tiziano
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention refers to a process for the production of the form I of the terazosin monohydrochloride anhydrous by heating terazosin suspended in a mixture made by methanol and by a solvent selected from the alcohols straight or branched, from C2 to C6, the esters of the carboxylic aliphatic acids from C1 to C8 with the alcohols straight or, branched, from C1 to C8, the aliphatic ketones from C3 to C8 the aliphatic ethers, straight, branched or cyclic from C4 to C8, the aliphatic amides and the aliphatic nitriles with a methanol solution of hydrochloric acid.
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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 October 29, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 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.
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.