US4729793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for manufacturing wall of dispensing device
Assignee: Alza Corp
•
Filing: 1986-09-02
•
Granted: 1988-03-08
•
Expires: 2006-09-02
Abstract
Abstract A dispensing device is disclosed for delivering a beneficial agent. The device comprises (1) a housing defining an internal space, (2) heat responsive means containing a beneficial agent in the space, (3) means for increasing the amount of beneficial agent delivered from the device in the space, (4) expandable means in the space, (5) an optional dense means in the space, and (6) means in the housing for delivering the beneficial agent from the dispensing device.
Inventors
- 👤 James B. Eckenhoff
- 👤 Richard Cortese
- 👤 Felix A. Landrau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0002; A61K9/0004; A61M; A61M31/00; A61M31/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
A composition for forming a wall of a dispensing device, said composition comprising cellulose acetate butyrate, cellulose acetate, tributyl citrate and triethyl citrate.
Claim 2
Dependent Claim
23 words
A composition for forming a wall of a dispensing device, said composition comprising cellulose acetate butyrate, cellulose acetate, tributyl citrate and triethyl citrate.
Claim 3
Dependent Claim
26 words
A composition useful for manufacturing a wall of a dispensing device, said composition comprising cellulose acetate butyrate, cellulose acetate, tributyl citrate, triethyl citrate and polyethylene glycol.
Claim 4
Dependent Claim
26 words
A composition useful for manufacturing a wall of a dispensing device, said composition comprising cellulose acetate butyrate, cellulose acetate, tributyl citrate, triethyl citrate and polyethylene glycol.
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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) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |