Drug delivery system for subconjunctival administration of fine particles
CA 2476935 C · Owner: Santen Pharmaceutical Co. Ltd. · Inventors: Kuwano, Mitsuaki; Yamada, Kazuhito
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an excellent drug delivery system to posterior segments. An injection according to the present invention is a subconjunctival injection which comprises fine particles containing a drug and enables the drug to deliver to the posterior segments. The drug can be efficiently delivered to the posterior segments (such as a retina a choroid and an optic nerve) while scarcely injuring ophthalmic tissues by administering the fine particles containing the drug subconjunctivally Preferred fine particles are made of a synthetic biodegradable polymer, their average particle dispersed in the fine particles uniformly. Preferred diameter is 50 nm to 150 µ m, and …
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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 February 21, 2003 and granted May 28, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 21, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 2025.
- 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.