US3816536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-2-disubstituted cycloalkane-1,3-diones
Assignee: Bayer Pharma AG
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Filing: 1971-04-02
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Granted: 1974-06-11
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Expires: 1991-04-02
Abstract
Abstract R2-CH2-CO-CH2-CH2-C(-R1)<(-CO-CH2-(CH2)N-CO-) 2,2-DISUBSTITUTED CYCLOALKANE-1,3-DIONES HAVING THE FORMULA: WHEREIN N IS 1 OR 2, R1 IS LOWER ALKYL, AND R2 IS HYDROGEN OR AN ORGANIC GROUP PREPARED BY REACTING A CYCLOALKANE1,3-DIONE HAVING THE FORMULA: WHEREIN R2 HAS THE SAME MEANING AS ABOVE. R2CH2COCH=CH2 WHEREIN N AND R1 HAVE THE SAME MEANING AS ABOVE IN A SOLVENT OR MIXTURE OF SOLVENTS IN THE ABSENCE OF ANY CATALYST WITH A VINYLKETONE HAVING THE FORMULA: R1-CH<(-CO-CH2-(CH2)N-CO-)
Inventors
- 👤 U Eder
- 👤 G Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:02
CPC Classifications
C; C07; C07D; C07D317/00; C07D317/08; C07D317/44; C07D317/46; C07C; C07C45/00; C07C45/27; C07C45/29; C07C45/292; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C45/73; C07C49/00; C07C49/20; C07C49/227; C07C49/385; C07C49/395; C07C49/403; C07C49/587; C07C49/687; C07C57/00; C07C57/52
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |