Hydroxylamine compounds
CA 2040103 A1 · Owner: Stanek, Jaroslav · Inventors: Stanek, Jaroslav; Frei, Jorg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
4-18032/A, Hvdroxylamine compounds, Abstract Compounds of formula, (I), wherein R1 is amino or is a radical wherein R3 is lower alkyl, hydroxy-lower alkyl lower alkoxy-lower alkyl, carboxy, lower alkoxycarbonyl, phenyl, phenyl substituted by lower alkyl halo-lower alkyl, hydroxy-, lower alkyl halogen, hydroxy, lower alkoxy, lower alkanoyloxy and/or by nitro pyridyl, pyridyl substituted by lower alkyl hydroxy-lower alkyl, lower alkoxy-lower alkyl phosphonooxy-lower alkyl, lower alkanoyl carboxy, lower alkoxycarbonyl, hydroxy lower alkoxy, lower alkanoyloxy, nitro and/or by oxido or quinolyl, R4 is hydrogen, lower, alkyl hydroxy-lower alkyl or halo-lower alkyl or R3 and R4 together are …
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 April 9, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2013.
- 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.