Polymeric prodrugs of amino- and hydroxyl-containing bioactive agents
CA 2312975 C · Owner: Pendri, Annapurna · Inventors: Choe, Yun H.; Greenwald, Richard B.; Zalipsky, Samuel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to double prodrugs containing polymericbased transport forms. These polymeric prodrugs are preferably of formula (I) wherein: L1 is a bifunctional linking moiety; in formula (a) B is H a leaving , group, a residue of an amine-containing moiety or a residue of a hydroxyl-, containing moiety; Y1-4 are independently O S, or NR12; R1, R4, R9, R10 and , R12, are independently selected from the group consisting of hydrogen C1-6 alkyls, C3-12 branched alkyls, C3-8 cycloalkyls C1-6 substituted alkyls, C3-8 , substituted cycloalkyls aryls, substituted aryls, aralkyls, C1-6 heteroalkyls, substituted C1-6 heteroalkyls; R2 R3, R5 and R6 are , independently 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 December 14, 1998 and granted August 21, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 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
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.