Phenylsulphone derivatives
CA 2026003 A1 · Owner: Morris, Jeffrey James · Inventors: Morris, Jeffrey James; Preston, John; Brown, Steven Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
57) Abstract, The invention discloses a novel aminophenylsulphone derivative (and its salts) which is an inhibitor of the enzyme aldose reductase, pharmaceutical compositions containing the novel derivative and processes for its manufacture. The invention also discloses certain novel N-acyl derivatives of the aminophenylsulphone derivative which are useful in the production of the latter derivative.
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 February 2, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 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.