US3873590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methyl esters of organic sulfonic acid oligomers
Assignee: Chevron USA Inc
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Filing: 1972-07-28
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Granted: 1975-03-25
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Expires: 1992-07-28
Abstract
Abstract Organic disulfonic acids are produced by heating a sulfonate monomer at a temperature above 110*C. in the substantial absence of water. Olefin sulfonation product mixtures, hydroxyalkane sulfonic acids, alkane sultones, alkene sulfonic acids and mixtures thereof are oligomerized under these conditions.
Inventors
- 👤 Alan E Straus
- 👤 William A Sweeney
- 👤 Ralph House
- 👤 Samuel H Sharman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:58
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/92; C09K8/94; C07; C07G; C07G99/00; C07G99/002; C09K8/02; C11; C11D; C11D1/00; C11D1/02; C11D1/12; C11D3/00; C11D3/16; C11D3/34; C11D3/3481; C11D3/3409
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
THE METHYL ESTERS OF THE OLIGOMERIC SULFONIC ACID COMPOSITIONS OBTAINED BY THE OLIGOMERIZATION PROCESS WHICH COMPRISES HEATING IN THE LIQUID PHASE A FEED, WHEREIN THE HEATING IS AT A TEMPERATURE ABOVE ABOUT 110*C, AND BELOW THE CARBONIZATION TEMPERATURE OF THE FEED, IS EFFECTED IN THE SUBSTANTIAL ABSENCE OF WATER, AND IN CONTINUED FOR A PERIOD OF AT LEAST SUFFICIENT FOR A SIGNIFICANT CONVERSATION OF THE FEED TO THE CORRESOPNDING OLIGOMERIC DISULFONIC ACID, SAID FEED BEING AT LEAST ONE COMPOUND HAVING A CARBON ATOM CONTENT IN THE RANGE FROM 5 TO 30 SELECTED FROM THE GROUP OF THE TYPE AND FORMULA A. SULTONE, R2(OSO2) B. HYDROXYSULFONIC ACID, R2(OH)(SO3H) C. UNSATURATED SULFONIC ACID, R R2(-CH=CH-) SO3H; WHEREIN R IS HYDROGEN OR A MONOVALENT HYDROCARBON RADICAL AND R2 IS A DIVALENT HYDROCARBON RADICAL, SAID RADICALS BEING FREE OF NONAROMATIC CARBON-CARBON DOUBLE- OR TRIPLE-BOND UNSATURATED.
Claim 2
Dependent Claim
141 words
THE METHYL ESTERS OF THE OLIGOMERIC SULFONIC ACID COMPOSITIONS OBTAINED BY THE OLIGOMERIZATION PROCESS WHICH COMPRISES HEATING IN THE LIQUID PHASE A FEED, WHEREIN THE HEATING IS AT A TEMPERATURE ABOVE ABOUT 110*C, AND BELOW THE CARBONIZATION TEMPERATURE OF THE FEED, IS EFFECTED IN THE SUBSTANTIAL ABSENCE OF WATER, AND IN CONTINUED FOR A PERIOD OF AT LEAST SUFFICIENT FOR A SIGNIFICANT CONVERSATION OF THE FEED TO THE CORRESOPNDING OLIGOMERIC DISULFONIC ACID, SAID FEED BEING AT LEAST ONE COMPOUND HAVING A CARBON ATOM CONTENT IN THE RANGE FROM 5 TO 30 SELECTED FROM THE GROUP OF THE TYPE AND FORMULA A. SULTONE, R2(OSO2) B. HYDROXYSULFONIC ACID, R2(OH)(SO3H) C. UNSATURATED SULFONIC ACID, R R2(-CH=CH-) SO3H; WHEREIN R IS HYDROGEN OR A MONOVALENT HYDROCARBON RADICAL AND R2 IS A DIVALENT HYDROCARBON RADICAL, SAID RADICALS BEING FREE OF NONAROMATIC CARBON-CARBON DOUBLE- OR TRIPLE-BOND UNSATURATED.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |