Oral pharmaceutical controlled release multiple unit dosage form
CA 2000932 C · Owner: Malmqvist-Granlund, Karin · Inventors: Malmqvist-Granlund, Karin; Hermansson, Christer; Kulstad, Soren
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an oral pharmaceutical multiple units formulation comprising individual cores containing a pharmacologically active substance said cores being provided with a coating consisting essentially of a polymer that is insoluble in, impermeable to and non-soluble in water and in gastrointestinal fluids, and a watersoluble pore-creating substance which is , randomly, distributed in said polymer whereby said coated cores form units providing an essential zero order diffusion controlled release rate of said active substance. The invention also comprises a method of preparing these formulations.
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 October 18, 1989 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2011.
- 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.