US3132075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid medicinal dosage forms coated with hydroxyethylcellulose and hydrolyzed styrene-maleic anhydride copolymer
Assignee: Pharmacia and Upjohn Co
•
Filing: 1960-10-17
•
Granted: 1964-05-05
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Expires: 1980-10-17
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
45 words
A SOLID MEDICINAL DOSAGE FORM SURROUNDED BY A COATING CONSISTING ESSENTIALLY OF FROM ABOUT 25 TO ABOUT 90% W./W. OF HYDROXYETHYLCELLULOSE AND FROM ABOUT 10 TO ABOUT 75% W./W. OF HYDROLYZED STYRENE-MALEIC ANHYDRIDE COPOLYMER WHEREIN SAID HYDROXYETHYLCELLULOSE AND HYDROLYZED STYRENE-MALEIC ANHYDRIDE COPOLYMER ARE HOMOGENEOUSLY INTERMIXED.
Claim 2
Dependent Claim
45 words
A SOLID MEDICINAL DOSAGE FORM SURROUNDED BY A COATING CONSISTING ESSENTIALLY OF FROM ABOUT 25 TO ABOUT 90% W./W. OF HYDROXYETHYLCELLULOSE AND FROM ABOUT 10 TO ABOUT 75% W./W. OF HYDROLYZED STYRENE-MALEIC ANHYDRIDE COPOLYMER WHEREIN SAID HYDROXYETHYLCELLULOSE AND HYDROLYZED STYRENE-MALEIC ANHYDRIDE COPOLYMER ARE HOMOGENEOUSLY INTERMIXED.
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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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |