Water soluble high molecular polymerized drug preparation
CA 2016505 C · Owner: Nippon Kayaku Kabushiki Kaisha · Inventors: Sakurai, Yasuhisa; Yamada, Noriko; Inoue, Shohei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is a water-soluble high molecular polymerized drug comprising a water-soluble block copolymer consisting of a hydrophilic segment and a hydrophobic pharmacological-functioning segment to side chain of which a drug is bonded. The hydrophilic first segment of the present invention include polyethylene glycol, polysaccharides polyacrylamide, and so on. The hydrophobic segment being attached to a drug include polyaspartic acid, polyglutamic acid polylysine, or, derivatives thereof. Drugs to be attached to the hydrophobic segment include anti-cancer drugs, drugs for central nerve drugs for, peripheral nerve, drugs for circulatory organs and so on.
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 May 10, 1990 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 2012.
- 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.