US4801739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oligomeric hydroxycarboxylic acid derivatives, their production and use
Assignee: Sandoz AG
•
Filing: 1983-12-16
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Granted: 1989-01-31
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Expires: 2003-12-16
Abstract
Abstract A product of an oligomer derived from glycolic acid and/or lactic acid, the oligomer having a molecular weight of from 500 to 10,000, the free carboxylic acid group of the oligomer being at least partially in the form of an amide with an amino acid or an ester with a sterol may be used as a matrix material for depot forms, containing pharmacologically active agents.
Inventors
- 👤 Joachim Franz
- 👤 Walter Prikoszovich
- 👤 Zdenek Brich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/14; A61K9/16; A61K9/1605; A61K9/1629; A61K9/1641; A61K9/1647; C; C08; C08G; C08G63/00; C08G63/02; C08G63/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A modified oligomer consisting of units of lactic acid and/or glycolic acid, the oligomer moiety having a molecular weight of from 500 to 10,000, in which the terminal carboxy group is in the form of an amide of an alpha amino acid.
Claim 2
Dependent Claim
42 words
A modified oligomer consisting of units of lactic acid and/or glycolic acid, the oligomer moiety having a molecular weight of from 500 to 10,000, in which the terminal carboxy group is in the form of an amide of an alpha amino acid.
Claim 3
Dependent Claim
21 words
The modified oligomer of claim 1 wherein the terminal carboxy group is in the form of an alpha amino acid amide.
Claim 4
Dependent Claim
17 words
The modified oligomer of claim 1 wherein the terminal carboxy group is in the form of phenylalanine.
Claim 5
Dependent Claim
14 words
The modified oligomer of claim 1 wherein the oligomer moiety contains lactic acid units.
Claim 6
Dependent Claim
15 words
The modified oligomer of claim 1 having a molecular weight of from 750 to 5,000.
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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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |