Patent US3785965A successfully refreshed from Google Patents.
US3785965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the desulfurization of petroleum oil fractions
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-10-28
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Granted: 1974-01-15
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Expires: 1991-10-28
Abstract
Abstract LOW SULFUR-CONTENT PETROLEUM OIL STOCKS ARE PREPARED BY CONTACTING A SULFUR-CONTAINING OIL STOCK WITH AN ALKALI METAL, PREFERABLY SODIUM, OR ALKYLI METAL ALLOY, PREFERABLY SODIUM/LEAD, TO PRODUCE AN ALKALI SULFIDE-OIL DISPERSION. THE ALKALI SULFIDE IS REMOVED FROM THE OIL BY MEANS OF A TWO-STAGE WASHING TREATMENT. THE RECOVERED SULFIDE, AFTER ADDITIONAL TREATMENT, IS THEN ELECTROLYTICALLY DECOMPOSED THEREBY FERORMING ALKALI METAL FOR REUSE IN THE DESULFURIZATION PROCESS.
Inventors
- 👤 A Welty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:54
CPC Classifications
C; C10; C10G; C10G53/00; C10G53/02; C10G53/12
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |