Patent US4367741A successfully refreshed from Google Patents.
US4367741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispenser powered by cross-linked hydrophilic polymer grafted to hydrophilic polymer
Assignee: Alza Corp
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Filing: 1980-12-22
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Granted: 1983-01-11
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Expires: 2000-12-22
Abstract
Abstract A dispenser is disclosed comprising a housing formed of a laminate of a cross-linked hydrophilic polymer layer grafted to a noncross-linked hydrophilic layer. The housing surrounds a container made of an elastomeric material and the container has an outlet through the housing to the exterior of the dispenser.
Inventors
- 👤 Alan S. Michaels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:53
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0002; A61K9/0004; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/042; A61M; A61M31/00; A61M31/002
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
124 words
A dispenser comprising: a housing formed of a laminate comprising a layer of a cross-linked hydrophilic polymer grafted to a layer of a noncross-linked hydrophilic polymer; a container within the housing, said container made of a material changeable from a storing capacity to a substantially emptied capacity over time; an outlet mean in the container that communicates with the container and the exterior of the dispenser, and wherein, when the dispenser is in operation in the environment of use, the dispenser releases its contents in response to the laminate absorbing fluid from the environment and expanding, thereby exerting pressure on the container which changes from a storing capacity to a substantially emptied capacity and dispenses its contents through the outlet means from the dispenser.
Claim 2
Dependent Claim
124 words
A dispenser comprising: a housing formed of a laminate comprising a layer of a cross-linked hydrophilic polymer grafted to a layer of a noncross-linked hydrophilic polymer; a container within the housing, said container made of a material changeable from a storing capacity to a substantially emptied capacity over time; an outlet mean in the container that communicates with the container and the exterior of the dispenser, and wherein, when the dispenser is in operation in the environment of use, the dispenser releases its contents in response to the laminate absorbing fluid from the environment and expanding, thereby exerting pressure on the container which changes from a storing capacity to a substantially emptied capacity and dispenses its contents through the outlet means from the dispenser.
Claim 3
Dependent Claim
13 words
The dispenser of claim 1 wherein the container is charged with a fluid.
Claim 4
Dependent Claim
14 words
The dispenser of claim 1 wherein the container is charged with a beneficial agent.
Claim 5
Dependent Claim
31 words
The dispenser of claim 1 wherein the cross-linked hydrophilic polymer is formed from a mixture of a monoethylenically unsaturated monomer and a cross-linking monomer containing at least two ethylenic double bonds.
Claim 6
Dependent Claim
23 words
The dispenser of claim 1 wherein the hydrophilic polymer is homogenous and a noncross-linked polymer, and is formed from a monoethylenically unsaturated monomer.
Claim 7
Dependent Claim
24 words
The dispenser of claim 1 wherein the container contains a drug, which drug is present in solution, in semi-solid, or in a thixotropic formulation.
Claim 8
Dependent Claim
16 words
The dispenser of claim 1 wherein the dispenser is sized, shaped and adapted for oral use.
Claim 9
Dependent Claim
16 words
The dispenser of claim 1 wherein the dispenser is sized, shaped and adapted for vaginal use.
Claim 10
Dependent Claim
16 words
The dispenser of claim 1 wherein the dispenser is sized, shaped and adapted for ano-rectal use.
Claim 11
Dependent Claim
18 words
The dispenser of claim 1 wherein the dispenser is sized, shaped and adapted for use as an implant.
Claim 12
Dependent Claim
42 words
The dispenser of claim 1 wherein the container is made of a member selected from the group consisting of natural rubber, gutta percha, cyclized rubber, silicone rubber, isoprene rubber, butadiene rubber, styrenebutadiene rubber, nitrile rubber, chloroprene rubber, ethylene-butylene rubber, and butyl rubber.
Claim 13
Dependent Claim
18 words
The dispenser of claim 1 wherein the container is connected to a conduit leading to a distant site.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |