Swelling-controlled oral delivery system for drugs
CA 2006268 A1 · Owner: Greenley, Robert Z. · Inventors: Greenley, Robert Z.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Swelling-controlled drug delivery system for enteral administration of a therapeutic agent includes a therapeutic agent imbibed in a polymeric material which swells minimally in a gastric environment with no significant loss of said therapeutic agent and swells extensively while remaining insoluble in an environment having a pH value greater than that of the gastric environment with release of an effective amount of the therapeutic agent.
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 December 21, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 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.