US3773770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing pyridine n-oxide carbanion salts and derivatives thereof
Assignee: Procter and Gamble Co
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Filing: 1968-09-30
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Granted: 1973-11-20
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Expires: 1988-09-30
Abstract
Abstract PROCESS FOR PREPARING 2-PYRIDINE N-OXIDE CARBANION SALTS, 2-PYRIDINETHIOL N/OXIDES, SALTS THEREOF AND 2,2''-DITHIOPYRIDINE N,N''-DIOXIDES WHICH COMPRISES THE STEPS OF (1) HEATING AN ALKALI METAL OR ALKALINE EARTH METAL SALT OF AN A-PICOLINIC ACID AT FROM 80*C. TO ABOUT 150*C. TO FORM A PYRIDINE N-OXIDE CARBANION SALT AND (2) REACTING IN CARBANION SALT FORMED THEREBY WITH A SULFUR-CONTAINING COMPOUND.
Inventors
- 👤 R Damico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:05
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/89
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |