Biodegradable multi-block polymeric composition capable of sol-gel transition
CA 2574976 C · Owner: Seo, Min-Hyo · Inventors: Lee, Sang-Jun; Shim, Myung-Seob; Seo, Min-Hyo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an ionic multi-block copolymer composition comprising , tri--block copolymers having a polypropylene oxide or polybutylene oxide block positioned between , two polyethylene oxide blocks and the tri-block copolymers are connected through dicarboxylic , acid linkages forming a multi-block copolymer having a weight average molecular weight of , more than 40,000 Dalton. The higher weight average molecular weight enables the hydrogel , formed from the multi-block copolymer of the present invention to maintain its gel status for , more than several days.
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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 August 1, 2005 and granted January 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 1, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.