US2887440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enteric coating
Assignee: Dow Chemical Co
•
Filing: 1957-08-12
•
Granted: 1959-05-19
•
Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Jr George K Greminger
- 👤 Francis E Windover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:42
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/4816; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/286; A61K9/2866
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
AN ENTERIC COATING COMPOSITION COMPRISING A MIXTURE OF (1) HYDROXYPROPYL METHYLCELLULOSE CONTAINING 5 TO 15% BY WEIGHT OF 2-HYDROXYPROPOXYL GROUPS AND 27 TO 32% BY WEIGHT OF METHOXYL GROUPS AND (2) ETHYLCELLULOSE CONTAINING 42 TO 49.5% BY WEIGHT OF ETHOXYL GROUPS, THE RATIO OF COMPONENTS (1) AND (2) IN SAID MIXTURE BEING BETWEEN ABOUT 3:1 AND 1:3 PARTS BY WEIGHT.
Claim 2
Dependent Claim
60 words
AN ENTERIC COATING COMPOSITION COMPRISING A MIXTURE OF (1) HYDROXYPROPYL METHYLCELLULOSE CONTAINING 5 TO 15% BY WEIGHT OF 2-HYDROXYPROPOXYL GROUPS AND 27 TO 32% BY WEIGHT OF METHOXYL GROUPS AND (2) ETHYLCELLULOSE CONTAINING 42 TO 49.5% BY WEIGHT OF ETHOXYL GROUPS, THE RATIO OF COMPONENTS (1) AND (2) IN SAID MIXTURE BEING BETWEEN ABOUT 3:1 AND 1:3 PARTS BY WEIGHT.
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) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |