Patent US4786500A successfully refreshed from Google Patents.
US4786500A
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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 20:48
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.
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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 |