Cationic graft-copolymer for non-viral gene delivery vector
CA 2553313 C · Owner: Onishi, Yasuhiko · Inventors: Onishi, Yasuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cationic graft-copolymer for a non-viral gene delivery vector comprising a unit derived from a cationic derivative of a water-soluble linear polymers having a hydroxyl groups, namely, a cationic polysaccharide of the following formula (1) C6H7O2 (OH)3-a (OX)a x H2O (1) and the cationic derivative of polyvinylalcohol of the following formula (2) or the cationic derivative of the partial hydrolyzed polyvinylalcohol of the following formula (3) CH2 CH(OH)1-b (OX)b n (2) CH2CH(OH)1-b-c (OX)b (OAc)c n (3) and a unit derived from a polymerizable olefin compound of the following formula (4) R4 R6 - C - C - (4) R5 R7(a, x, b, n, c, Ac, X R4, R5, R6, and R7 are defined in , claim 1-6); a …
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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 January 8, 2004 and granted March 18, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 8, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 2026.
- 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.