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US4292300A
Expired / Lapsed
US
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Controlled release suppositories
Assignee: Aventis Pharmaceuticals Inc
•
Filing: 1977-07-20
•
Granted: 1981-09-29
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Expires: 1997-07-20
Abstract
Abstract A slow-release suppository is provided. The slow-release suppository comprises a linear polymer, water and a therapeutically active ingredient.
Inventors
- 👤 Geoffry A. Byrne
- 👤 Ross I. Aylott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:20
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
A non-dissolving, non-disintegrating slow-release suppository consisting essentially of methyl cellulose, water, and a therapeutically effective amount of a water-soluble therapeutically active ingredient wherein the water is present in an amount of more than 35 parts by weight.
Claim 2
Dependent Claim
37 words
A non-dissolving, non-disintegrating slow-release suppository consisting essentially of methyl cellulose, water, and a therapeutically effective amount of a water-soluble therapeutically active ingredient wherein the water is present in an amount of more than 35 parts by weight.
Claim 3
Dependent Claim
38 words
The slow-release suppository according to claim 1, wherein the amount of methyl cellulose is from about 30 to about 65 parts by weight, and the amount of water is from about 35 to about 70 parts by weight.
Claim 4
Dependent Claim
36 words
The slow-release suppository according to claim 2, wherein the amount of methyl cellulose is from about 30 to 60 parts by weight, and the amount of water is from about 40 to 70 parts by weight.
Claim 5
Dependent Claim
30 words
The slow-release suppository according to claim 3, wherein the amount of methyl cellulose is, essentially, 50 parts by weight, and the amount of water is, essentially, 50 parts by weight.
Claim 6
Dependent Claim
20 words
The slow-release suppository according to claim 4, wherein the methyl cellulose has a molecular weight between about 100,000 and 300,000.
Claim 7
Dependent Claim
42 words
A slow-release suppository according to claim 1, wherein the therapeutically active ingredient is selected from the group consisting of lignocaine hydrochloride, phenylephrine chloride, betamethasone sodium phosphate, sodium prednisolone metasulphobenzoate, di-sodium prednisolone phosphate, methylprednisolone sodium succinate, dexamethasone sodium phosphate and hydrocortisone sodium phosphate.
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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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |