Salts of aromatic sulphonic acids
CA 2290070 A1 · Owner: Heeres, Gerardus Johannes · Inventors: Heeres, Gerardus Johannes; Van Bakel, Franciscus Hermanus Antonius Adreana
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a salt of the CNS-depressant trans-5- chloro-2,3,3a,12btetrahydro-2- methyl-1H-dibenz2,3:6,7 oxepino4,5-cpyrrole and a saltforming agent, the latter being an aromatic sulphonic acid. The disclosed salt, preferably the besylate, has favourable properties. Thus it has the required insolubility and crytallinity in order to be suitable for use in depot injection preparations.
Read the whole patent
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 May 19, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 19, 2020.
- 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.