Osmotically driven dispenser having a composite wall
CA 1074653 A · Owner: Alza Corporation · Inventors: Theeuwes, Felix; Ayer, Atul D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This application discloses an osmotically driven dispenser for dispensing an active agent to a liquid containing environment that has improved resistance to degradation by the active agent. The dispenser comprises: a wall that is permeable to the liquid in the environment and defines a compartment; an active agent composition contained within the compartment that is osmotically effective relative to said liquid and to which the wall is substantially impermeable; and an outlet passageway in the wall through which the active agent composition is dispensed to the environment. The wall is formed of a composite blend of (1) a wall-forming material that is permeable to the liquid and …
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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
- Granted April 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 1, 1997.
- 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.