New linker for bioactive agents
CA 2067184 C · Owner: Pharmacia S.P.A. · Inventors: Bersani, Laura; Suarato, Antonino; Ruggieri, Daniela
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Conjugates of general formula (I): A-O-W-Za-T wherein the moiety A-O- is the residue of drug of formula A-O-H in, which -O-H is-a primary or secondary hydroxyl group; a is an integer of from 1 to 30; W is a group of general formula (2) wherein b is an integer of from 1 to 4 B represents a C1-C3 alkylene group , and R1 and R2 each independently represent hydrogen, halogen, alkyl, phenyl or substituted phenyl; Z is a spacer group and T is a carrier moiety.
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 August 1, 1991 and granted November 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 1, 2013.
- 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.