Patent US3315171A successfully refreshed from Google Patents.
US3143472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enteric compositions
Assignee: Eli Lilly and Co
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Filing: 1961-09-25
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Granted: 1964-08-04
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Expires: 1981-09-25
Abstract
No abstract record available.
Inventors
- 👤 Lewis C Lappas
- 👤 Charles W Mckeehan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5005; A61K9/5021; A61K9/5026; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/284; C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
AN ENTERIC MEDICAMENT WHICH COMPRISES A DRUG PROTECTED FROM THE GASTRIC ENVIRONMENT BY A COATING OF A PARTIAL ESTER OF A COPOLYMER SELECTED FROM THE GROUP CONSISTING OF THE POLY(OLEFIN-MALEIC ANHYDRIDE)S WHEREIN THE OLEFIN MOIETY CONTAINS FROM 2 TO 20 CARBON ATOMS AND THE POLY(VINYL ALKYL ETHER-MALEIC ANHYDRIDE)S WHEREIN THE ALKYL GROUP CONTAINS FROM 1 TO 3 CARBON ATOMS, SAID PARTIAL ESTER BEING WATER SOLUBLE AT A PH GREATER THAN ABOUT 3.5.
Claim 2
Dependent Claim
72 words
AN ENTERIC MEDICAMENT WHICH COMPRISES A DRUG PROTECTED FROM THE GASTRIC ENVIRONMENT BY A COATING OF A PARTIAL ESTER OF A COPOLYMER SELECTED FROM THE GROUP CONSISTING OF THE POLY(OLEFIN-MALEIC ANHYDRIDE)S WHEREIN THE OLEFIN MOIETY CONTAINS FROM 2 TO 20 CARBON ATOMS AND THE POLY(VINYL ALKYL ETHER-MALEIC ANHYDRIDE)S WHEREIN THE ALKYL GROUP CONTAINS FROM 1 TO 3 CARBON ATOMS, SAID PARTIAL ESTER BEING WATER SOLUBLE AT A PH GREATER THAN ABOUT 3.5.
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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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |