Hydroxylation of salicylic acid derivatives
CA 2219012 A1 · Owner: Vincent, Renaud · Inventors: Kumarathasan, Premkumari; Vincent, Renaud
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention disclosed relates to the novel compound 5-amino tetrahydroxy benzoic acid and derivatives thereof, e.g. pharmaceutically acceptable acid addition salts, to a process for the preparation thereof which involves reacting5-amino salicylic acid with hydroxyl radical and to a method of using 5-amino, tetrahydroxy benzoic acid and derivatives thereof as a biomarker for the presence of hydroxyl radical in biological systems.
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 October 17, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 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
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.