Patent US3638017A successfully refreshed from Google Patents.
Patent US4445641A successfully refreshed from Google Patents.
US4445641A
Expired / Lapsed
US
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Controlled-release dispenser
Assignee: Bend Research Inc
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Filing: 1982-01-08
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Granted: 1984-05-01
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Expires: 2002-01-08
Abstract
Abstract A dispenser for active ingredients is disclosed which provides zero-order rate of release of essentially all of the active ingredients. The dispenser comprises a rate-controlling membrane and a solid microporous polymeric reservoir having interconnected or continuous pores capable of retaining the active ingredient by capillary forces, the reservoir being such that the active ingredient is essentially insoluble therein.
Inventors
- 👤 Richard W. Baker
- 👤 Yasuo Ninomiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:08
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/12; A01; A01M; A01M13/00; A01N; A01N25/00; A01N25/18; A01N25/34; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2027; A61K9/70; A61L9/042; Y; Y10; Y10S; Y10S43/00; Y10S43/90
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
A controlled-release dispenser capable of dispensing essentially all of an active ingredient at a zero-order rate of release comprising a membrane controlling the rate of release of said active ingredient by diffusion through said membrane and a microporous reservoir material which is highly permeable to said active ingredient and in which said active ingredient is essentially insoluble, said microporous reservoir material having interconnected pores capable of retaining said active ingredient by capillary forces.
Claim 2
Dependent Claim
73 words
A controlled-release dispenser capable of dispensing essentially all of an active ingredient at a zero-order rate of release comprising a membrane controlling the rate of release of said active ingredient by diffusion through said membrane and a microporous reservoir material which is highly permeable to said active ingredient and in which said active ingredient is essentially insoluble, said microporous reservoir material having interconnected pores capable of retaining said active ingredient by capillary forces.
Claim 3
Dependent Claim
76 words
A controlled-release dispenser capable of dispensing essentially all of an active ingredient at a zero-order rate of release comprising an active ingredient, a membrane controlling the rate of release of said active ingredient by diffusion through said membrane and a microporous reservoir material which is highly permeable to said active ingredient and in which said active ingredient is essentially insoluble, said microporous reservoir material having interconnected pores capable of retaining said active ingredient by capillary forces.
Claim 4
Dependent Claim
76 words
A controlled-release dispenser capable of dispensing essentially all of an active ingredient at a zero-order rate of release comprising an active ingredient, a membrane controlling the rate of release of said active ingredient by diffusion through said membrane and a microporous reservoir material which is highly permeable to said active ingredient and in which said active ingredient is essentially insoluble, said microporous reservoir material having interconnected pores capable of retaining said active ingredient by capillary forces.
Claim 5
Dependent Claim
31 words
The controlled-release dispenser of claim 2 wherein the active ingredient is selected from pheromones, juvenile hormones, fragrances, insect attractants, insect repellants, perfumes, insecticides, fumigants, deodorizers, animal attractants, animal repellents and drugs.
Claim 6
Dependent Claim
16 words
The controlled-release dispenser of claim 3 wherein the active ingredient is a pheromone or insect attractant.
Claim 7
Dependent Claim
57 words
The controlled-release dispenser of claims 1 or 2 wherein the rate-controlling membrane is selected from polymers and copolymers of ethylene, propylene, ethylene/ethyl acrylate, ethylene/vinyl acetate, chlorinated ethylene, vinyl chloride, vinyl chloride/vinyl acetate, vinylidene chloride, ethylene terephthalate, ethylene/vinyl alcohol, ethylene/vinyl acetate/vinyl alcohol, ethylene/vinyloxyethanol, and styrene/acrylonitrile; rubbers of silicone, neoprene, butyl, and epichlorohydrin; polycarbonate; polyamides; polyimides; polyurethanes; and polyesters.
Claim 8
Dependent Claim
25 words
The controlled-release dispenser of claims 1 or 2 wherein the rate-controlling membrane is a polymer selected from polyethylenes, polyurethanes, polyesters, polyamides, polycarbonate, and vinyl polymers.
Claim 9
Dependent Claim
24 words
The controlled-release dispenser of claims 1 or 2 wherein the microporous reservoir material is selected from polysulfones, poly-tetrafluoroethylene, polycarbonate, polyurethanes, polyethylenes, and cellulose esters.
Claim 10
Dependent Claim
15 words
The controlled-release dispenser of claims 1 or 2 additionally containing anti-oxidants and/or ultraviolet light absorbers.
Claim 11
Dependent Claim
31 words
The controlled-release dispenser of claims 1 or 2 wherein a portion of the surface of the reservoir material is covered with a material that is essentially impermeable to the active ingredient.
Claim 12
Independent Claim
81 words
A method of dispensing essentially all of an active ingredient selected from pheromones, insect attractants and insect repellants at a zero-order rate of release comprising loading a microporous reservoir material with said active ingredient, said microporous reservoir material being highly permeable to said active ingredient and in which said active ingredient is essentially insoluble, said microporous reservoir material having interconnected pores capable of retaining said active ingredient by capillary forces, and releasing said active ingredient by diffusion through a rate-controlling membrane.
Claim 13
Independent Claim
81 words
A method of dispensing essentially all of an active ingredient selected from pheromones, insect attractants and insect repellants at a zero-order rate of release comprising loading a microporous reservoir material with said active ingredient, said microporous reservoir material being highly permeable to said active ingredient and in which said active ingredient is essentially insoluble, said microporous reservoir material having interconnected pores capable of retaining said active ingredient by capillary forces, and releasing said active ingredient by diffusion through a rate-controlling membrane.
Claim 14
Dependent Claim
22 words
The method of claim 10 wherein the rate-controlling membrane is a polymer selected from polyethylenes, polyurethanes, polyesters, polyamides, polycarbonate, and vinyl polymers.
Claim 15
Dependent Claim
21 words
The method of claim 10 wherein the microporous reservoir material is selected from polysulfones, polytetrafluoroethylene, polycarbonate, polyurethanes, polyethylenes, and cellulose esters.
References Cited (Backward Citations)
US3770199A
Cited
US4356969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |