US3914401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enteric compositions
Assignee: Eli Lilly and Co
•
Filing: 1974-03-20
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Granted: 1975-10-21
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Expires: 1994-03-20
Abstract
Abstract Partial alkylene glycol ether esters of C1-C4 alkyl acrylateunsaturated polybasic carboxylic acid anhydride copolymers and useful enteric compositions prepared therewith.
Inventors
- 👤 Moustafa M Sharabash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:41
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5084; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/284; A61K9/2846; A61K9/4891; A61K9/5073; A61K9/5078; C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
41 words
AN ENTERIC MEDICAMENT COMPRISING A DRUG PROTECTED FROM THE GASTRIC ENVIRONMENT BY A COATING COMPRISED OF A PARTIAL ALKYLENE GLYCOL ETHER OF A C1-C4 ALKYL ACRYLATEUNSATYRATED POLYBASIC CARBOXYLIC ACID ANHYDRIDE COPOLYMER SELECTED FROM THE GROUP HAVING AS A GENERAL FORMULA EITHER
Claim 2
Dependent Claim
41 words
AN ENTERIC MEDICAMENT COMPRISING A DRUG PROTECTED FROM THE GASTRIC ENVIRONMENT BY A COATING COMPRISED OF A PARTIAL ALKYLENE GLYCOL ETHER OF A C1-C4 ALKYL ACRYLATEUNSATYRATED POLYBASIC CARBOXYLIC ACID ANHYDRIDE COPOLYMER SELECTED FROM THE GROUP HAVING AS A GENERAL FORMULA EITHER
Claim 3
Dependent Claim
23 words
An enteric medicament according to claim 1, wherein the coating comprises the partial diethylene glycol monomethyl ether ester of ethyl acrylate-maleic anhydride copolymer.
Claim 4
Dependent Claim
23 words
An enteric medicament according to claim 1 wherein the coating comprises the partial dipropylene glycol monomethyl ether ester of n-butyl acryLate-itaconic anhydride copolymer.
Claim 5
Dependent Claim
23 words
An enteric medicament according to claim 1 wherein the coating comprises the partial triethylene glycol monoethyl ether ester of isobutyl acrylate-maleic anhydride copolymer.
Claim 6
Dependent Claim
23 words
An enteric medicament according to claim 1 wherein the coating comprises the partial diethylene glycol monomethyl ether ester of methyl acrylate-citraconic anhydride copolymer.
Claim 7
Dependent Claim
23 words
An enteric medicament according to claim 1 wherein the coating comprises the partial propylene glycol monomethyl ether ester of isopropyl acrylate-maleic anhydride copolymer.
Claim 8
Dependent Claim
15 words
A sustained release medicament comprising (1) a drug and (2) the composition of claim 1.
Claim 9
Dependent Claim
51 words
An enteric composition comprising a drug protected from the gastric environment by a coating comprised of a combination of a compound according to claim 1 and a partial C1-C4 alkanol ester of a C1-C4 alkyl acrylateunsaturated polybasic carboxylic acid anhydride copolymer selected from the group having as a general formula either
Claim 10
Dependent Claim
34 words
The composition of claim 8 wherein the coating comprises a mixture of the partial methyl ester of ethyl acrylate-maleic anhydride copolymer and the partial diethylene glycol mono-methyl ether ester of ethyl acrylate-maleic anhydride copolymer.
Claim 11
Dependent Claim
42 words
The composition of claim 9 wherein the ratio of the partial methyl ester of ethyl acrylate-maleic anhydride copolymer to the partial diethylene glycol monomethyl ether ester of ethyl acrylate-maleic anhydride copolymer is from about 1 to 9 to about 9 to 1.
Claim 12
Dependent Claim
34 words
The composition of claim 10 wherein the ratio of the partial methyl ester of ethyl acrylate-maleic anhydride copolymer to the partial diethylene glycol monomethyl ether ester of ethyl acrylate-maleic anhydride copolymer is about 1:1.
Claim 13
Dependent Claim
15 words
A sustained release medicament comprising (1) a drug and (2) the composition of claim 8.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |