US3520970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid oral drug medicament coated for rapid or gradual release with copolymers of polymerizable quaternary ammonium monomers and water-insoluble homopolymer-forming monomers
Assignee: Roehm GmbH Darmstadt
•
Filing: 1967-08-02
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Granted: 1970-07-21
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Expires: 1987-08-02
Abstract
No abstract record available.
Inventors
- 👤 Klaus Lehmann
- 👤 Gerhard Markert
- 👤 Gerhart W E Rothgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:46
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/284; A61K9/2846; Y; Y10; Y10S; Y10S526/00; Y10S526/923
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2984639A
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US2980634A
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US2990332A
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US3092547A
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US3121043A
Cited
US3158538A
Cited
US3091574A
Cited
US3308020A
Cited
US3325365A
Cited
US3336196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |