US2511784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions containing z
Assignee: —
•
Filing: —
•
Granted: 1950-06-13
•
Expires: 1967-06-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:41
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/62; C07C59/00; C07C59/40; C07C59/58; C07C59/64; C07C59/66; C07C59/68; C07C59/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
THE METHOD OF PREPARING 2,4-DICHLOROPHENOXYACETIC ACID WHICH COMPRISES ESSENTIALLY PASSING CHLORINE GAS INTO MOLTEN PHENOL AT A TEMPERATURE ABOVE THE MELTING POINT OF THE PHENOL UNTIL THE PHENOL IS PRINCIPALLY DICHLORINATED, CONDENSING THE RESULTANT MIXTURE WITH MONO-CHLOROACETIC ACID UNDER ALKALINE CONDITIONS AND ACIDIFYING THE RESULTANT REACTION MIXTURE, THE QUANTITY OF CHLORINE AND MONO-CLOROACETIC ACID BEING EFFECTIVE TO PRODUCE A CONDENSATION REACTION PRODUCE IN SAID REACTION MIXTURE COMPRISING ESSENTIASLLY AT LEAST 84% BY WEIGHT OF 2,4-DICHLOROPHENOXYACETIC ACID AND A MINOR PROPORTION OF 2,6-DICHLOROPHJENOXYACETIC ACID, 2-CHLOROPHEOXYACETIC ACID, 4-CHLOROPHENOXYACETIC ACID AND 2,4-6 TRICHOLOROPHENOXYACETIC ACID, TREATING SAID REACTION MIXTURE WITH WATER DURING SAID ACIDIFICATIOIN, ISOLATING THE INSOLUBLE PART OF SAID REACTION MIXTURE FROM THE SOLUBLE PART THEREOF, FURTHER TREATING THE ISOLATED PART WITH WATER, THE QUANTITY OF WATER ADDED TO THE REACTION MIXTURE DURING SAID ACIFICATION AND AFTERWARD TO SAID ISOLATED PART BEING SUFFICIENT TO DISSOLVE SUBSTANTIALLY ALL OF THE 2,6-DICHLORO-, THE 2-CHLORO-, AND THE 2.4,6-TRICHLOROPHENOXYACETIC ACIDS, AND SEPARATING THE RESULTANT AQUEOUS SOLUTION OF CHLOROPHENOXYACETIC ACIDS FROM THE RESIDUAL ISOLATED UNDISSOLVED PART OF THE REACTION MIXTURE.
Claim 2
Independent Claim
172 words
THE METHOD OF PREPARING 2,4-DICHLOROPHENOXYACETIC ACID WHICH COMPRISES ESSENTIALLY PASSING CHLORINE GAS INTO MOLTEN PHENOL AT A TEMPERATURE ABOVE THE MELTING POINT OF THE PHENOL UNTIL THE PHENOL IS PRINCIPALLY DICHLORINATED, CONDENSING THE RESULTANT MIXTURE WITH MONO-CHLOROACETIC ACID UNDER ALKALINE CONDITIONS AND ACIDIFYING THE RESULTANT REACTION MIXTURE, THE QUANTITY OF CHLORINE AND MONO-CLOROACETIC ACID BEING EFFECTIVE TO PRODUCE A CONDENSATION REACTION PRODUCE IN SAID REACTION MIXTURE COMPRISING ESSENTIASLLY AT LEAST 84% BY WEIGHT OF 2,4-DICHLOROPHENOXYACETIC ACID AND A MINOR PROPORTION OF 2,6-DICHLOROPHJENOXYACETIC ACID, 2-CHLOROPHEOXYACETIC ACID, 4-CHLOROPHENOXYACETIC ACID AND 2,4-6 TRICHOLOROPHENOXYACETIC ACID, TREATING SAID REACTION MIXTURE WITH WATER DURING SAID ACIDIFICATIOIN, ISOLATING THE INSOLUBLE PART OF SAID REACTION MIXTURE FROM THE SOLUBLE PART THEREOF, FURTHER TREATING THE ISOLATED PART WITH WATER, THE QUANTITY OF WATER ADDED TO THE REACTION MIXTURE DURING SAID ACIFICATION AND AFTERWARD TO SAID ISOLATED PART BEING SUFFICIENT TO DISSOLVE SUBSTANTIALLY ALL OF THE 2,6-DICHLORO-, THE 2-CHLORO-, AND THE 2.4,6-TRICHLOROPHENOXYACETIC ACIDS, AND SEPARATING THE RESULTANT AQUEOUS SOLUTION OF CHLOROPHENOXYACETIC ACIDS FROM THE RESIDUAL ISOLATED UNDISSOLVED PART OF THE REACTION MIXTURE.
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) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |