US2923734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of sulfo esters of alpha-methylene carboxylic acids
Assignee: Dow Chemical Co
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Filing: 1957-03-25
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Granted: 1960-02-02
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Expires: 1977-03-25
Abstract
No abstract record available.
Inventors
- 👤 David P Sheetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:10
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/62; D06P1/621; D06P1/622; B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0034; C; C07; C07C; C07C303/00; C07C303/02; C07C303/22; C08; C08F; C08F28/00; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A METHOD FOR PREPARATION OF SULFO ESTERS WHICH COMPRISES ESTERIFYING BY HEATING A MIXTURE COMPRISING A A-METHYLENE CARBOXYLIC ACID AND AN ALIPHATIC HYDROXY SULFONIC ACID AT AN ESTERIFICATION REACTION TEMPERATURE BETWEEN 50*C. AND 200*C. AND RECOVERING THE RESULTING SULFOALIPHATIC ESTER OF THE A-METHYLENE CARBOXYLIC ACID.
Claim 2
Independent Claim
45 words
A METHOD FOR PREPARATION OF SULFO ESTERS WHICH COMPRISES ESTERIFYING BY HEATING A MIXTURE COMPRISING A A-METHYLENE CARBOXYLIC ACID AND AN ALIPHATIC HYDROXY SULFONIC ACID AT AN ESTERIFICATION REACTION TEMPERATURE BETWEEN 50*C. AND 200*C. AND RECOVERING THE RESULTING SULFOALIPHATIC ESTER OF THE A-METHYLENE CARBOXYLIC ACID.
References Cited (Backward Citations)
US1881172A
Cited
US2812267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |