Patent US2748174A successfully refreshed from Google Patents.
US2748174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of pure 2, 4, 5-trichlorophenol from products of the alkaline hydrolysis of 1, 2, 4, 5-tetrachlorobenzene
Assignee: Olin Corp
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Filing: 1953-02-02
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Granted: 1956-05-29
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Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 Theodore M Jenney
- 👤 Bernard H Nicolaisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:18
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/01; C07C37/02; C07C37/055; C07C37/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS FOR THE PRODUCTION OF 2,4,5-TRICHLOROPHENOL FROM AQUEOUS MIXTURES OF CRUDE 2,4,5-TRICHLOROPHENATE OBTAINED BY CAUSTIC HYDROLYSIS OF 1,2,4,5-TETRACHLOROBENZENE, WHICH COMPRISES ADDING MINERAL ACID TO THE CRUDE 2,4,5-TRICHLOROPHENATE MIXTURE IN AMOUNT SUFFICIENT TO NEUTRALIZE EXCESS ALKALINITY AND A MINOR PROPORTION OF THE PHENATES PRESENT, WHICH FORM CORRESPONDING PHENOLS, SEPARATING THE PHENOLS AS SEPARATE PHASE FROM DILUTE AQUEOUS MIXTURE HAVING A PHENOL-PHENATE CONTENT OF NOT MORE THAN ABOUT 10% BY WEIGHT, ADDING MINERAL ACID TO THE SEPARATED AQUEOUS PHASE IN AN AMOUNT SUFFICIENT TO CONVERT LESS THAN THE TOTAL QUANTITY OF REMAINING PHENATES TO CORRESPONDING PHENOLS, AND SEPARATING 2,4,5-TRICHLOROPHENOL FROM THE AQUEOUS PHASE.
Claim 2
Dependent Claim
102 words
A PROCESS FOR THE PRODUCTION OF 2,4,5-TRICHLOROPHENOL FROM AQUEOUS MIXTURES OF CRUDE 2,4,5-TRICHLOROPHENATE OBTAINED BY CAUSTIC HYDROLYSIS OF 1,2,4,5-TETRACHLOROBENZENE, WHICH COMPRISES ADDING MINERAL ACID TO THE CRUDE 2,4,5-TRICHLOROPHENATE MIXTURE IN AMOUNT SUFFICIENT TO NEUTRALIZE EXCESS ALKALINITY AND A MINOR PROPORTION OF THE PHENATES PRESENT, WHICH FORM CORRESPONDING PHENOLS, SEPARATING THE PHENOLS AS SEPARATE PHASE FROM DILUTE AQUEOUS MIXTURE HAVING A PHENOL-PHENATE CONTENT OF NOT MORE THAN ABOUT 10% BY WEIGHT, ADDING MINERAL ACID TO THE SEPARATED AQUEOUS PHASE IN AN AMOUNT SUFFICIENT TO CONVERT LESS THAN THE TOTAL QUANTITY OF REMAINING PHENATES TO CORRESPONDING PHENOLS, AND SEPARATING 2,4,5-TRICHLOROPHENOL FROM THE AQUEOUS PHASE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |