US3538214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled release medicinal tablets
Assignee: Merck and Co Inc
•
Filing: 1969-04-22
•
Granted: 1970-11-03
•
Expires: 1989-04-22
Abstract
No abstract record available.
Inventors
- 👤 Gerald P Polli
- 👤 Clyde E Shoop
- 👤 Wayne M Grim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:08
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/286; A61K9/2866; A61K9/2072; A61K9/2086; A61K9/209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2881085A
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US2921883A
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US2887440A
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US3039933A
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US2971889A
Cited
US2928770A
Cited
US3079303A
Cited
US3096248A
Cited
US3030273A
Cited
US3112220A
Cited
US3247066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |