Patent US4639366A successfully refreshed from Google Patents.
US4639366A
Expired / Lapsed
US
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Polymers containing pendant acid functionalities and labile backbone bonds
Assignee: Merck and Co Inc
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Filing: 1984-06-06
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Granted: 1987-01-27
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Expires: 2004-06-06
Abstract
Abstract The instant invention is directed to a polymer with at least one labile backbone bond per repeat unit and at least one pendant acid functionality per thousand repeat units. The instant invention is also directed to a controlled release device which comprises: (A) a polymer with at least one labile backbone bond per repeat unit and at least one pendant acid functionality per thousand repeat units; and (B) a beneficial substance incorporated within or surrounded by the matrix of said polymer.
Inventors
- 👤 Jorge Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:28
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61K9/204; C; C08; C08G; C08G65/00; C08G65/34; C08G85/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
A polymer with at least one labile backbone bond per repeat unit and at least one pendant acid functionality per thousand repeat units.
Claim 2
Dependent Claim
23 words
A polymer with at least one labile backbone bond per repeat unit and at least one pendant acid functionality per thousand repeat units.
Claim 3
Dependent Claim
24 words
The polymer of claim 1, wherein the backbone of the polymer is selected from the group consisting of polyorthoesters, polyacetals, polyketals, polyesters and polyphosphazenes.
Claim 4
Dependent Claim
22 words
The polymer of claim 1, wherein the pendant acid functionality is selected from the group consisting of carboxylic, phosphoric, sulfonic and sulfenic.
Claim 5
Dependent Claim
59 words
The polymer of claim 1, prepared from a diol containing a pendant acid functionality selected from the group consisting of 9,10-dihydroxystearic acid; 3,6-dihydroxynaphthalene-2,7-disulfonic acid; 2,4-dihydroxybenzoic acid; 3,4-dihydroxycinnamic acid; 3,4-dihydrocinnamic acid; 6,7-dihydroxy-2-naphtahalene sulfonic acid; 2,5-dihydroxyphenylacetic acid; 2,4-dihydroxypyrimidine-5-carboxylic acid; 4,8-dihydroxyquinoline-2-carboxylic acid; and mixtures thereof; and at least one additional monomer selected from the group consisting of esters, acetals and mixtures thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |