Peroral drug delivery system
CA 2120748 A1 · Owner: Urtti, Arto Olavi · Inventors: Sutinen, Marja Riitta; Paronen, Timo Petteri; Urtti, Arto Olavi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention describes a device for peroral administration of a therapeutic agent which is capable of existing in an un-ionized therapeutically active form. The device comprises a reservoir comprising the therapeutic agent in ionized form which reservoir, has a wall permeable to un-ionized material and impermeable to ionized material; and a solid material which upon uptake of water is converted to a buffer; the solid material having on uptake of, water, a pH which determines the rate of permeation of the therapeutic agent in un-ionized form through the reservoir wall. The device enables the release of the therapeutic agent to be controlled by the pH of the buffer and, if desired the …
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 15, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 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.