US2854488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making 3,4-dichlorophenol
Assignee: Dow Chemical Co
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Filing: 1957-07-17
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Granted: 1958-09-30
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Expires: 1977-07-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Alexander H Widiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:00
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A METHOD FOR MAKING 3,4-DICHLOROPHENOL WHICH COMPRISES, PEROXIDIZING A MIXTURE CONSISTING ESSENTIALLY OF 3,4-DICHLOROCUMENE AND 2,3-DICHLOROCUMENE BY CONTACTING THE SAME WITH MOLECULAR OXYGEN IN THE PRESENCE OF ALKALI AND IN THE PRESENCE OF A CATALYTIC PROPORTION OF A PEROXY COMPOUND OXIDATION INITIATOR AT A TEMPERATURE BETWEEN 75* AND 125*C. UNTIL THE MIXTURE CONTAINS AN APPRECIABLE PROPORTION OF PEROXIDIZED DICHLOROCUMENE, DECOMPOSING THE PEROXIDIZED DICHLOROCUMENE BY CONTACTING THE SAME WITH AQUEOUS SULFURIC ACID AT A TEMPERATURE BETWEEN 50* AND 100*C. UNTIL THE MIXTURE CONTAINS AN REACTION MIXTURE THE PHENOLIC PRODUCT OF THE REACTION, IN WHICH PRODUCT THE PHENOLIC CONSTITUENT CONSISTS ESSENTIALLY OF 3,4-DICHLOROPHENOL.
Claim 2
Independent Claim
101 words
A METHOD FOR MAKING 3,4-DICHLOROPHENOL WHICH COMPRISES, PEROXIDIZING A MIXTURE CONSISTING ESSENTIALLY OF 3,4-DICHLOROCUMENE AND 2,3-DICHLOROCUMENE BY CONTACTING THE SAME WITH MOLECULAR OXYGEN IN THE PRESENCE OF ALKALI AND IN THE PRESENCE OF A CATALYTIC PROPORTION OF A PEROXY COMPOUND OXIDATION INITIATOR AT A TEMPERATURE BETWEEN 75* AND 125*C. UNTIL THE MIXTURE CONTAINS AN APPRECIABLE PROPORTION OF PEROXIDIZED DICHLOROCUMENE, DECOMPOSING THE PEROXIDIZED DICHLOROCUMENE BY CONTACTING THE SAME WITH AQUEOUS SULFURIC ACID AT A TEMPERATURE BETWEEN 50* AND 100*C. UNTIL THE MIXTURE CONTAINS AN REACTION MIXTURE THE PHENOLIC PRODUCT OF THE REACTION, IN WHICH PRODUCT THE PHENOLIC CONSTITUENT CONSISTS ESSENTIALLY OF 3,4-DICHLOROPHENOL.
References Cited (Backward Citations)
US2638464A
Cited
US2719864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |