US3660563A
Expired / Lapsed
US
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Water soluble entrapping of a drug
Assignee: National Patent Development Corp
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Filing: 1970-09-09
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Granted: 1972-05-02
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Expires: 1990-09-09
Abstract
Abstract MATERIALS ARE ENTRAPPED IN WATER SOLUBLE HYDROXYALKYL ACRYLATE OR METHACRYLATE POLYMERS TO PROVIDE READY SOURCES OF THE MATERIAL BY THE DELETION OF WATER. THUS, THERE CAN BE ENTRAPPED DRUGS, PESTICIDES, FLAVORING AGENTS AND FRAGRANCES.
Inventors
- 👤 Francis E Gould
- 👤 Thomas H Shepherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:31
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/50; C11D3/502; C11D3/505; A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; A23; A23L; A23L27/00; A23L27/70; A23L27/74; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61L17/00; A61L17/14; A61L17/145; A61L9/00; A61L9/015; A61L9/04; A61L9/042; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/26; C08F220/28; C08K; C08K5/00; C08K5/0008; C08K5/0058; C09; C09D; C09D4/00; C11D17/00; C11D17/0039; C11D3/16; C11D3/38; C11D3/386; C11D3/38672; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |