Patent US2598692A successfully refreshed from Google Patents.
US2598692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sodium 2, 4, 5-trichlorophenoxyacetate
Assignee: Mathieson Chemical Corp
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Filing: 1950-05-02
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Granted: 1952-06-03
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Expires: 1970-05-02
Abstract
No abstract record available.
Inventors
- 👤 Gustav J Henrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:38
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/40; C07C59/58; C07C59/64; C07C59/66; C07C59/68; C07C59/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN TH EMANUFACTURE OF SODIUM 2,4,5-TRICHLOROPHENOXYACETATE BY CONDENSATION OF 2,4,5-TRICHLOROPHENOL AND CHLOROACETIC ACID IN ALKALINE SOLUTION, THE IMPROVEMENT WHICH COMPRISES FORMING AN AQUEOUS MIXTURE CONTAINING SODIUM 2,4,5-TRICHLORPHENATE AND SODIUM CHLOROACETATE IN APPROXIMATELY STOICHIOMETRIC PROPORTIONS AND WHICH CONTAINS FROM ABOUT 1. TO ABOUT 50 MOLES OF WATER TO 1 MOLE OF THE SODIUM CHLOROACETATE, REACTING THE MIXTURE AT ELEVATED TEMPERATURE FOR ABOUT 3 HOURS, MAINTAINING THE MIXTURE IN LIQUID SLURRY FORM BY ADDING WATER DURING THE COURSE OF THE REACTION IN AN AMOUNT AT LEAST SUFFICIENT TO BRING THE TOTAL QUANTITY OF WATER USED IN THE PROCESS TO ABOUT 74 MOLES TO 1 MOLE OF SODIUM CHLOROACETATE AND RECOVERING THE SOLID PRODUCT BY SEPARATION FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
117 words
IN TH EMANUFACTURE OF SODIUM 2,4,5-TRICHLOROPHENOXYACETATE BY CONDENSATION OF 2,4,5-TRICHLOROPHENOL AND CHLOROACETIC ACID IN ALKALINE SOLUTION, THE IMPROVEMENT WHICH COMPRISES FORMING AN AQUEOUS MIXTURE CONTAINING SODIUM 2,4,5-TRICHLORPHENATE AND SODIUM CHLOROACETATE IN APPROXIMATELY STOICHIOMETRIC PROPORTIONS AND WHICH CONTAINS FROM ABOUT 1. TO ABOUT 50 MOLES OF WATER TO 1 MOLE OF THE SODIUM CHLOROACETATE, REACTING THE MIXTURE AT ELEVATED TEMPERATURE FOR ABOUT 3 HOURS, MAINTAINING THE MIXTURE IN LIQUID SLURRY FORM BY ADDING WATER DURING THE COURSE OF THE REACTION IN AN AMOUNT AT LEAST SUFFICIENT TO BRING THE TOTAL QUANTITY OF WATER USED IN THE PROCESS TO ABOUT 74 MOLES TO 1 MOLE OF SODIUM CHLOROACETATE AND RECOVERING THE SOLID PRODUCT BY SEPARATION FROM 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) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |