US3282790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enteric coated tablet
Assignee: Pharmacia and Upjohn Co
•
Filing: 1963-05-31
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Granted: 1966-11-01
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Expires: 1983-05-31
Abstract
No abstract record available.
Inventors
- 👤 Richard H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:49
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/284; A61K9/286; A61K9/2866
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A SOLID MEDICINAL DOSAGE FORM SURROUNDED BY AN ENTERIC COATING, SAID COATING COMPRISING HOMOGENOUSLY INTERMIXED METHYLCELLULOSE AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROLYZED STYRENE-MALEIC ANHYDRIDE COPOLYMER AND CELLULOSE ACETATE PHTHALATE, SAID METHYLCELLULOSE HAVING A CONCENTRATION OF FROM ABOUT 25 TO ABOUT 90% OF SAID COATING AND SAID MEMBER HAVING A CONCENTRATION OF FROM ABOUT 10 TO ABOUT 75% OF SAID COATING.
Claim 2
Dependent Claim
64 words
A SOLID MEDICINAL DOSAGE FORM SURROUNDED BY AN ENTERIC COATING, SAID COATING COMPRISING HOMOGENOUSLY INTERMIXED METHYLCELLULOSE AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROLYZED STYRENE-MALEIC ANHYDRIDE COPOLYMER AND CELLULOSE ACETATE PHTHALATE, SAID METHYLCELLULOSE HAVING A CONCENTRATION OF FROM ABOUT 25 TO ABOUT 90% OF SAID COATING AND SAID MEMBER HAVING A CONCENTRATION OF FROM ABOUT 10 TO ABOUT 75% OF SAID COATING.
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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |