US4842867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsed drug delivery of doxylamine
Assignee: Alza Corp
•
Filing: 1986-05-09
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Granted: 1989-06-27
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Expires: 2006-05-09
Abstract
Abstract A dosage form comprising (1) an immediately available dose of a beneficial drug followed by a timed delayed dose of drug, or (2) a timed delayed dose of drug.
Inventors
- 👤 Atul D. Ayer
- 👤 Felix Theeuwes
- 👤 Patrick S. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:30
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0002; A61K9/0004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A single dosage form comprising two doses of a beneficial drug formulation useful as a sleep-aid for administering to a recipient, said dosage form comprising: (a) a dosage amount of a first dose of a doxylamine formulation coated on the exterior surface of the dosage form; (b) a first wall comprising in at least a part a semipermeable composition permeable to the passage of fluid, said wall surrounding; (c) a second wall comprising means for delaying release of a doxylamine formulation from the interior of the dosage form, said second wall surrounding; (d) a first layer comprising a second dose of a doxylamine formulation; (e) a second layer comprising a hydrophilic hydrogel formulation that swells in the presence of fluid; and, (f) at least one exit means in the wall for releasing doxylamine formulation from the interior of the dosage form.
Claim 2
Dependent Claim
141 words
A single dosage form comprising two doses of a beneficial drug formulation useful as a sleep-aid for administering to a recipient, said dosage form comprising: (a) a dosage amount of a first dose of a doxylamine formulation coated on the exterior surface of the dosage form; (b) a first wall comprising in at least a part a semipermeable composition permeable to the passage of fluid, said wall surrounding; (c) a second wall comprising means for delaying release of a doxylamine formulation from the interior of the dosage form, said second wall surrounding; (d) a first layer comprising a second dose of a doxylamine formulation; (e) a second layer comprising a hydrophilic hydrogel formulation that swells in the presence of fluid; and, (f) at least one exit means in the wall for releasing doxylamine formulation from the interior of the dosage form.
References Cited (Backward Citations)
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |