US3763208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of amine compounds in the sulfation of alcohols
Assignee: Electric Reduction Company of Canada Ltd
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Filing: 1970-10-19
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Granted: 1973-10-02
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Expires: 1990-10-19
Abstract
Abstract A PROCESS FOR SULPHATING MATERIALS HAVING FREE OH GROUPS SUCH AS PRIMARY, SECONDARY, AND TERTIARY ALCOHOLS AND ALKYLENE OXIDE CONDENSATES OF ALCOHOLS OR PHENOLS WHICH COMPRISES REACTING THE SAID SULPHATABLE MATERIAL WITH SULPHUR TRIOXIDE IN THE PRESENCE OF A FURTHER PRODUCT OBTAINED BY THE ACTION OF AN AMINO COMPOUND ON THE PRODUCT OBTAINED FROM THE SULPHATION REACTION. AT MOST ONLY A SMALL EXCESS OF SULPHUR TRIOXIDE IS EMPLOYED AND MILD CONDITIONS ARE MAINTAINED THROUGHOUT THE REACTION.
Inventors
- 👤 A Sowerby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:05
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/24
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |