Oral preparation for release in lower digestive tracts
CA 2121038 C · Owner: Takama, Shigeyuki · Inventors: Fujisawa, Misuzu; Inamoto, Yukiko; Wato, Takahiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An oral pharmaceutical preparation of a type released at infragastrointestinal tract was successfully prepared wherein a, solid organic acid dissolvable in the form of a solution, of, chitosan and a solid pharmaceutical preparation including a principal agent are filled in a hard capsule composed of the base principally comprising chitosan and an enteric coating is formed on the surface of the hard capsule, characterized in that a desirable releasing time can be arranged, with no pH dependency via water, permeability derived from the porosity of chitosan of the capsule preparation.
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 13, 1992 and granted May 14, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2014.
- 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.