US4605548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drug administration material
Assignee: Nitto Denko Corp
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Filing: 1984-07-18
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Granted: 1986-08-12
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Expires: 2004-07-18
Abstract
Abstract A drug administration material for continuously administering an active drug at a controlled rate through an integument or mucous membrane, which comprises a drug-retaining layer having provided on at least one side thereof a drug administration layer which continuously feeds an active drug to an integument or mucous membrane, said drug administration layer comprising a porous membrane containing in pores thereof a liquid having a limited solubility for the active drug.
Inventors
- 👤 Keiichi Ushiyama
- 👤 Hisashi Ichinose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:16
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/70; A61K9/7023; A61K9/703; A61K9/7084; A61K9/0012; A61K9/0053; A61K9/006
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
A drug administration material for continuously administering an active drug at a controlled rate through an integument which comprises, in sequence, an adhesive film which comprises a film and a pressure sensitive layer, a barrier layer, a drug-retaining layer, a drug administration layer which continuously feeds an active drug to the integument, and a delaminatible protective film, said drug administration layer comprising a porous membrane containing in pores thereof, a liquid having a limited solubility for the active drug, wherein said liquid is stabily retained in the porous membrane by capillary pressure.
Claim 2
Dependent Claim
92 words
A drug administration material for continuously administering an active drug at a controlled rate through an integument which comprises, in sequence, an adhesive film which comprises a film and a pressure sensitive layer, a barrier layer, a drug-retaining layer, a drug administration layer which continuously feeds an active drug to the integument, and a delaminatible protective film, said drug administration layer comprising a porous membrane containing in pores thereof, a liquid having a limited solubility for the active drug, wherein said liquid is stabily retained in the porous membrane by capillary pressure.
Claim 3
Dependent Claim
22 words
A drug administration material as in claim 1, wherein said porous membrane has a pore diameter size of 10 μm or less.
Claim 4
Dependent Claim
30 words
A drug administration material as in claim 1, wherein the membrane comprises pores of a pore size of 0.01 to 5μ and has a void space of at least 70%.
Claim 5
Dependent Claim
21 words
A drug administration material as in claim 1, wherein the drug-retaining layer and the drug administration layer both contain active drug.
References Cited (Backward Citations)
US4292299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |