Patent US3721707A successfully refreshed from Google Patents.
US3721707A
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Organic sulfonic acid oligomers and production process
Assignee: Chevron USA Inc
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Filing: 1969-09-15
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Granted: 1973-03-20
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Expires: 1989-09-15
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
- 👤 A Straus
- 👤 W Sweeney
- 👤 S Sharman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:26
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; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |