Dual drug dosage forms with improved separation of drugs
CA 2531721 C · Owner: Louie-Helm, Jenny · Inventors: Louie-Helm, Jenny; Lim, Jong; Shell, John, N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Drug tablets that include a prolonged-release core and an immediate-release layer or shell are prepared with a thin barrier layer of drug-free polymer between the prolonged-release and immediate-release portions of the tablet. The barrier layer is penetrable by gastrointestinal fluid thereby providing , full access of the gastrointestinal fluid to the prolonged-release core but , remains intact during the application of the immediate-release layer substantially reducing or eliminating any penetration of the immediate-release drug into the prolonged-release portion.
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 July 13, 2004 and granted June 11, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 13, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 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
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.