3-hydroxypyridin-4-one derivatives as pharmaceutical compositions
CA 2100158 A1 · Owner: Hider, Robert Charles · Inventors: Hider, Robert Charles; Whitehead, Susan; Peto, Timothy Edward Alexander
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2100158 9212131 PCTABS00014, 3-Hydroxypyridin-4-ones of formula (I) in which R1 is selected from hydrogen, C1-3 aliphatic hydrocarbon groups 2-hydroxyethyl, C1-4 aliphatic hydrocarbon groups substituted by a single carboxy, sulpho, sulphamoyl or N-methyl or N-ethyl sulphamoyl group, and an ethyl group substituted at the 1- or 2-position by a carboxy, sulpho, sulphamoyl or N-methyl or N-ethyl sulphamoyl group and at the 2-position by a hydroxy group and R2, R3 and R4, are each separately selected from hydrogen C1-3 aliphatic, hydrocarbon groups, hydroxymethyl 1-hydroxyethyl, 2-hydroxyethyl, 2-methoxymethyl C1-4 aliphatic hydrocarbon groups substituted by a single carboxy, sulpho, …
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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 January 7, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 2014.
- 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.