10,11-methylenedioxy-20(rs)-camptothecin and 10,11-methylenedioxy-20(s)-camptothecin analogs
CA 2066780 C · Owner: Nicholas, Allan W. · Inventors: Nicholas, Allan W.; Wani, Mansukh C.; Wall, Monroe E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A camptothecin analog having structures (I) or (II) where Z is H or C1-8 , alkyl and R is NO2 NH2, N3, hydrogen, halog-, en, COOH, OH O-C1-3 alkyl, SH, S-C1-3 alkyl, CN, CH2NH2 NH-C1-3 alkyl, CH2-, NH-C1-3 alkyl, N(C1-3 alkyl)2 CH2N(C1-3 alkyl)2, O-, NH- or S-CH2CH2N(CH2CH2OH)2 O-, NH- or S-, CH2CH2CH2N(CH2CH2OH)2, O- NH- or S-, CH2CH2N(CH2CH2CH2OH)2, O-, NH- or S-CH2CH2CH2N(CH2CH2CH2OH2)2 O-, NH- or S-, CH2CH2N(C1-3 alkyl)2, O- NH- or S-CH2CH2CH2N(C1-3 alkyl)2, CHO, C1-3 alkyl or NHCOCHR1NR2R3 where , R1 is the side-chain of an .alpha.-amino acid and R2 and R3, independently are hydrogen or a lower alkyl group or R3 is a peptide unit containing 1-3 amino acid units bonded to the nitrogen …
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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 September 17, 1990 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 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
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.