Regioisomeric benzothiopyranopyridines having antitumor activity
CA 2288274 A1 · Owner: Krapcho, A. Paul · Inventors: Krapcho, A. Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to benzothiopyrano 2,3-b- 3,2-b- and 3,2-c-, pyridines substituted in the positions 6 and 9. The compounds of the invention have general formula (I) wherein: one of X Y or Z is nitrogen (-N=), the , others being carbon (-CH=); R' is selected from the group consisting of (C1- C4)alkyl, nitro or -NH-R1, wherein R1 is selected from the group consisting of -CO-CH2-NR2R3, (C1-C10)alkyl, (C2-C10)alkyl having one or two substituents selected from the group consisting of -OR4 and -NR2R3 (C2-C10)alkyl , interrupted by one or two oxygen atoms or by one -NR5- group and said (C2-, C10)alkyl being optionally substituted by one or two hydroxy or -NR2R3 groups; R is selected …
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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 April 28, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 2020.
- 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
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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.