Patent US2870206A successfully refreshed from Google Patents.
US2870206A
Expired / Lapsed
US
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Preparation of benzophenone-azine
Assignee: Rhone Poulenc SA
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Filing: 1957-11-29
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Granted: 1959-01-20
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Expires: 1977-11-29
Abstract
No abstract record available.
Inventors
- 👤 Meyer Robert
- 👤 Pillon Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:41
CPC Classifications
C; C07; C07C; C07C251/00; C07C251/72; C07C251/88
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
A PROCESS FOR THE PREPARATION OF BENZOPHENONEAZINE WHICH COMPRISES REACTING BENZOPHENONE-IMINE WITH OXYGEN-CONTAINING GAS IN A PROPORTION OF AT LEAST I MOL OF OXYGEN FOR EACH 4 MOLS OF BENZOPHENONE-IMINE IN THE PRESENCE OF A CATALYTICALLY EFFECTIVE AMOUNT OF CUPROUS CHLORIDE AND AT A TEMPERATURE WHICH IS AT ALL TIMES BELOW THE DECOMPOSITION TEMPERATURE OF BENZOPHENONE-AZINE, AND IN THE PRESENCE OF A DILUENT IN THE FORM OF A SOLVENT CHOSEN FROM THE GROUP CONSISTING OF BENZOPHENONE, PYRIDINE, TOLUENE AND DIOXAN.
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) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |