US2865958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonation process
Assignee: Shell Development Co
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Filing: 1957-06-20
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Granted: 1958-12-23
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Expires: 1977-06-20
Abstract
No abstract record available.
Inventors
- 👤 Davies Donald Graham
- 👤 Peperzak Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:16
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/02; C07C303/04; C07C303/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN A PROCESS FOR SULFONATING A SULFONATABLE ORGANIC MATERIAL BY CONTACTING THE MATERIAL IN THE FORM OF VERY SMALL DROPLETS WITH A GAS CONTAINING SULFUR TRIOXIDE, IN THE FORM OF A DISPERSION OF THE DROPLETS IN THE GAS, SAPARATING THE GASEOUS AND LIQUID PORTIONS OF THE RESULTING MIXTURE AND RECOVERING SULFONIC ACID PRODUCT FROM THE SEPAARATED LIQUID, THE IMPROVEMENT WHICH CONSISTS OF MAINTAINING THE SAID DISPERSION OF THE ORGANIC MATERIAL IN THE SULFUR TRIOXIDE-CONTAINING GAS FOR FROM ABOUT 0.01 SECOND TO ABOUT 5.0 SECONDS AND THEREAFTER CONTACTING SAID DISPERSION WITH A MASS OF THE SAID ORGANIC MATERIAL CONTAINING AT LEAST 1% BY WEIGHT OF THE SULFONIC ACID REACTION PRODUCT.
Claim 2
Dependent Claim
109 words
IN A PROCESS FOR SULFONATING A SULFONATABLE ORGANIC MATERIAL BY CONTACTING THE MATERIAL IN THE FORM OF VERY SMALL DROPLETS WITH A GAS CONTAINING SULFUR TRIOXIDE, IN THE FORM OF A DISPERSION OF THE DROPLETS IN THE GAS, SAPARATING THE GASEOUS AND LIQUID PORTIONS OF THE RESULTING MIXTURE AND RECOVERING SULFONIC ACID PRODUCT FROM THE SEPAARATED LIQUID, THE IMPROVEMENT WHICH CONSISTS OF MAINTAINING THE SAID DISPERSION OF THE ORGANIC MATERIAL IN THE SULFUR TRIOXIDE-CONTAINING GAS FOR FROM ABOUT 0.01 SECOND TO ABOUT 5.0 SECONDS AND THEREAFTER CONTACTING SAID DISPERSION WITH A MASS OF THE SAID ORGANIC MATERIAL CONTAINING AT LEAST 1% BY WEIGHT OF THE SULFONIC ACID REACTION PRODUCT.
References Cited (Backward Citations)
US2691040A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |