US4786500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmable agent delivery system
Assignee: Alza Corp
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Filing: 1986-06-26
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Granted: 1988-11-22
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Expires: 2006-06-26
Abstract
Abstract This invention pertains to a programmable delivery system.
Inventors
- 👤 Patrick S.-L. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:08
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0002; A61K9/0004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A delivery system for delivering a beneficial drug at a controlled rate to a biological environment, wherein the delivery system is comprised of: (a) a reservoir comprising a first surface and a second surface, which reservoir is dimensioned for use and retention in a biological environment, the reservoir comprising a polymeric formulation that is pervious to the passage of drug; (b) a beneficial drug in the reservoir; (c) a first wall occluding the first surface of the reservoir, the first wall essentially-free of drug and impervious to the passage of drug; (d) a second wall occluding the second surface of the reservoir, the second wall comprising a polymeric formulation substantially impervious to the passage of an osmotically effective solute; and (e) an osmotically effective solute in the second wall.
Claim 2
Dependent Claim
129 words
A delivery system for delivering a beneficial drug at a controlled rate to a biological environment, wherein the delivery system is comprised of: (a) a reservoir comprising a first surface and a second surface, which reservoir is dimensioned for use and retention in a biological environment, the reservoir comprising a polymeric formulation that is pervious to the passage of drug; (b) a beneficial drug in the reservoir; (c) a first wall occluding the first surface of the reservoir, the first wall essentially-free of drug and impervious to the passage of drug; (d) a second wall occluding the second surface of the reservoir, the second wall comprising a polymeric formulation substantially impervious to the passage of an osmotically effective solute; and (e) an osmotically effective solute in the second wall.
References Cited (Backward Citations)
US4077407A
Cited
US4160020A
Cited
US4008719A
Cited
US4014334A
Cited
US4058122A
Cited
US4111203A
Cited
US4160452A
Cited
US4256108A
Cited
US4432964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |