Patent EP0040457A2 successfully refreshed from Google Patents.
EP0040457A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Agent dispenser with microporous releasing diffusor
Assignee: Alza Corp
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Filing: 1981-01-22
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Granted: —
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Expires: 2001-01-22
Abstract
Abstract A dispenser is disclosed for delivering an active agent to an aqueous environment. The dispenser comprises an internal compartment with a partition that divides the compartment into a first space and a second space. The first space contains the active agent and the second space contains a gel or an osmotically effective compound. An exterior wall of a microporous polymer, or a microporous polymer and a semi- permeable polymer surrounds the compartment.
Inventors
- 👤 Felix Theeuwes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 10:42
CPC Classifications
A; A61; A61M; A61M31/00; A61M31/002; A61K; A61K9/00; A61K9/0002; A61K9/0004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A dispenser for the controlled delivery of an active agent into a fluid environment, the dispenser comprising an exterior wall surrounding and forming an internal compartment, a flexible partition in the compartment separating the compartment into a first space and a second space, an active agent in the first space and a swellable lightly cross-linked polymer or an osmotically effective solute in the second compartment, the dispenser characterized in that the exterior wall is formed of a microporous polymer when the second space contains a swellable cross-linked polymer, or the exterior wall is formed of a microporous and a semipermeable polymer with the semipermeable polymer surrounding a part of the second space containing a swellable cross-linked polymer or an osmotically effective solute.
Claim 2
Dependent Claim
122 words
A dispenser for the controlled delivery of an active agent into a fluid environment, the dispenser comprising an exterior wall surrounding and forming an internal compartment, a flexible partition in the compartment separating the compartment into a first space and a second space, an active agent in the first space and a swellable lightly cross-linked polymer or an osmotically effective solute in the second compartment, the dispenser characterized in that the exterior wall is formed of a microporous polymer when the second space contains a swellable cross-linked polymer, or the exterior wall is formed of a microporous and a semipermeable polymer with the semipermeable polymer surrounding a part of the second space containing a swellable cross-linked polymer or an osmotically effective solute.
References Cited (Backward Citations)
No citation records indexed.
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