Patent US3296316A successfully refreshed from Google Patents.
US3296316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dealkylation of branched-chain p-alkylated phenols
Assignee: Consolidation Coal Co
•
Filing: 1961-11-27
•
Granted: 1967-01-03
•
Expires: 1981-11-27
Abstract
No abstract record available.
Inventors
- 👤 Martin B Neuworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:51
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR DEALKYLATING A DEALKYLATABLE MONOBASIC PHENOL CONTAINING A BRANCHED-CHAIN ALKYL GROUP IN THE PARA POSITION AND OTHERWISE UNSUBSTITUTED ON THE NUCLEUS BY OTHER THAN ALKYL GROUPS, SAID PHENOL BEING SELECTED FROM THE GROUP CONSISTING OF P-NONYLATED PHENOL, P-T-BUTYLATED METACRESOL, 2,6-DI-T-BUTYL-P-CRESOL, 4-T-BUTYLO-CRESOL, 4,6-DI-T-BUTYL-O-CRESOL, AND A MIXTURE OF 4-T-BUTYLO-CRESOL AND 4,6-DI-T-BUTYL-O-CRESOL, WHICH COMPRISES HEATING A MIXTURE OF SAID PHENOL AND FROM 0.3 TO 10 PERCENT BY WEIGHT, BASED ON ALUMINUM CONTENT, OF AN ALUMINUM PHENOXIDE FOR AT LEAST 2 HOURS AT A TEMPERATURE BETWEEN 150 AND 400*C. AT WHICH A GASEOUS OLDFIN IS FORMED, AND RECOVERING FROM THE REACTION MIXTURE THE PHENOL STRIPPED OF SAID BRANCHED-CHAIN ALKYL GROUP IN THE PARA POSITION.
Claim 2
Dependent Claim
112 words
A PROCESS FOR DEALKYLATING A DEALKYLATABLE MONOBASIC PHENOL CONTAINING A BRANCHED-CHAIN ALKYL GROUP IN THE PARA POSITION AND OTHERWISE UNSUBSTITUTED ON THE NUCLEUS BY OTHER THAN ALKYL GROUPS, SAID PHENOL BEING SELECTED FROM THE GROUP CONSISTING OF P-NONYLATED PHENOL, P-T-BUTYLATED METACRESOL, 2,6-DI-T-BUTYL-P-CRESOL, 4-T-BUTYLO-CRESOL, 4,6-DI-T-BUTYL-O-CRESOL, AND A MIXTURE OF 4-T-BUTYLO-CRESOL AND 4,6-DI-T-BUTYL-O-CRESOL, WHICH COMPRISES HEATING A MIXTURE OF SAID PHENOL AND FROM 0.3 TO 10 PERCENT BY WEIGHT, BASED ON ALUMINUM CONTENT, OF AN ALUMINUM PHENOXIDE FOR AT LEAST 2 HOURS AT A TEMPERATURE BETWEEN 150 AND 400*C. AT WHICH A GASEOUS OLDFIN IS FORMED, AND RECOVERING FROM THE REACTION MIXTURE THE PHENOL STRIPPED OF SAID BRANCHED-CHAIN ALKYL GROUP IN THE PARA POSITION.
References Cited (Backward Citations)
US2425858A
Cited
US2206924A
Cited
US2831898A
Cited
US2836627A
Cited
US2923745A
Cited
US3091646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |