Steroidal derivatives
CA 2438221 A1 · Owner: Song, Ching · Inventors: Liao, Shutsung; Song, Ching
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of formula (1), wherein each of R1 R2, R4, R4', R7, R11, R12, R15, R16, R17' independently, is hydrogen, hydroxy, amino carboxyl, oxo, halo, sulfonic acid, -O-sulfonic acid or alkyl that is optionally inserted with -NH- -N(alkyl)-, -O-, -S-, -SO-, -SO2, -O-SO2 -SO2-O-, -SO3-O-, -CO-, -CO-O-, -O-, CO- -CO-NH-, -CO-N(alkyl)-, -NH-CO-, or-N(alkyl-COand further optionally , substituted with hydroxy halo, amino, carboxyl, sulfonic acid, or -O-sulfonic acid; R3 is X-Y-, wherein X is hydrogen amino, carboxyl, halo, sulfonic acid, -O-sulfonic acid or alkyl; Y is -S-, -NH-, -N(alkyl)-, -SO- -SO2, -O-SO2-, -, SO2-O-, -SO3-O-, -CO- -CO-O-, -O-CO-, -CO-N(alkyl)-CO-; R5 and R6 together, are …
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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 February 7, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 2024.
- 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.