Patent US3658849A successfully refreshed from Google Patents.
US3658849A
Expired / Lapsed
US
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Treatment of 2-substituted aldehydes with lead dioxide
Assignee: RJ Reynolds Tobacco Co
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Filing: 1969-02-19
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Granted: 1972-04-25
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Expires: 1989-02-19
Abstract
Abstract A PROCESS FOR PRODUCING SUBSTITUTED $-LACTONES AND SUBSTITUTED ALKENOXYALCOHOLS FROM 2-SUBSTITUTED ALDEHYDES USING LEAD DIOXIDE.
Inventors
- 👤 John Charles Leffingwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:29
CPC Classifications
C; C07; C07D; C07D315/00; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C47/00; C07C47/02; C07C47/12; C07C47/20; C07C47/277; C07C47/28; C07C47/34; C07C47/38; C07C47/47; C07D317/00; C07D317/08; C07D317/10; C07D317/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |