High molecular weight polymer-based prodrugs
CA 2208841 C · Owner: Greenwald, Richard B. · Inventors: Greenwald, Richard B.; Pendri, Annapurna
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
High molecular weight, water-soluble prodrugs of formula (I) wherein: D is a , biologically active moiety; M is X or Q; X is an electron withdrawing group; Q is a moiety containing a free electron pair positioned five or six atoms from Y'; Y and Y' are oxygen or sulfur; and R is a polyalkylene oxide are , disclosed. Methods of preparing the compounds as well as methods of treatment using the compounds are also disclosed.
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 January 30, 1996 and granted October 2, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 30, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2018.
- 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.