US2905674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing 3, 3', 5, 5'-tetraalkyl-4, 4'-diphenoquinones
Assignee: Ethyl Corp
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Filing: 1956-10-17
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Granted: 1959-09-22
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Expires: 1976-10-17
Abstract
No abstract record available.
Inventors
- 👤 Allen H Filbey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:22
CPC Classifications
C; C07; C07C; C07C50/00; C07C50/08; C07C46/00; C07C46/02; C07C46/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
PROCESS OF PREPARING 3,3'',5,5'' -TETRAALKYL DIPHENOQUIONES FROM 4-HALO-2,6-DIALKYLPHENOLS WHEREIN THE ALKYL GROUPS CONTAIN NOT MORE THAN 12 CARBON ATOMS EACH AND AT LEAST ONE OF THE ALKYL GROUPS OF SAID PHENOL IS BRANCHED ON ITS ALPHA CARBON ATOM, SAID PHENOL BEING FURTHER CHARACTERIZED IN THAT THE HALOGEN ATOM THEREOF HAS AN ATOMIC WEIGHT GREATER THAN 30; SAID PROCESS BEING CHARACTERIZED BY PREPARING A LIQUID MIXTURE CONSISTING ESSENTIALLY OF SAID 4-HALO-2,6-DIALKYLPHENOL AND AT LEAST ABOUT ONE MOLE OF A BASIC COMPOUND PER MOLE OF SAID PHENOL, SAID BASIC COMPOUND HAVING AN IONIZATION CONSTANT CHARACTERISTIC OF A BASE OF AT LEAST ABOUT 1.6X10O AT 25* C. IN AQUEOUS SOLUTION; AND SUBJECTING SAID MIXTURE TO A TEMPERATURE OF FROM ABOUT 90* C. TO ABOUT 200* C. FOR A PERIOD IN THE ORDER OF ABOUT 2 TO ABOUT 24 HOURS.
Claim 2
Dependent Claim
136 words
PROCESS OF PREPARING 3,3'',5,5'' -TETRAALKYL DIPHENOQUIONES FROM 4-HALO-2,6-DIALKYLPHENOLS WHEREIN THE ALKYL GROUPS CONTAIN NOT MORE THAN 12 CARBON ATOMS EACH AND AT LEAST ONE OF THE ALKYL GROUPS OF SAID PHENOL IS BRANCHED ON ITS ALPHA CARBON ATOM, SAID PHENOL BEING FURTHER CHARACTERIZED IN THAT THE HALOGEN ATOM THEREOF HAS AN ATOMIC WEIGHT GREATER THAN 30; SAID PROCESS BEING CHARACTERIZED BY PREPARING A LIQUID MIXTURE CONSISTING ESSENTIALLY OF SAID 4-HALO-2,6-DIALKYLPHENOL AND AT LEAST ABOUT ONE MOLE OF A BASIC COMPOUND PER MOLE OF SAID PHENOL, SAID BASIC COMPOUND HAVING AN IONIZATION CONSTANT CHARACTERISTIC OF A BASE OF AT LEAST ABOUT 1.6X10O AT 25* C. IN AQUEOUS SOLUTION; AND SUBJECTING SAID MIXTURE TO A TEMPERATURE OF FROM ABOUT 90* C. TO ABOUT 200* C. FOR A PERIOD IN THE ORDER OF ABOUT 2 TO ABOUT 24 HOURS.
References Cited (Backward Citations)
US2785188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |