Patent US3576737A successfully refreshed from Google Patents.
US3576737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vanadium removal from hydrocarbons
Assignee: Chevron USA Inc
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Filing: 1969-03-25
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Granted: 1971-04-27
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Expires: 1989-03-25
Abstract
Abstract A PROCESS FRO REMOVING VANADIUM FROM A HYDROCARBON FEEDSTOCK CONTAINING VANADIUM AS A SOLUBLE ORGANOMETALLIC COMPOUND BY CONTACTING SAID HYDROCARBON FEEDSTOCK AT AN ELEVATED TEMPERATURE AND PRESSURE AND IN THE PRESENCE OF HYDROGEN WITH PARTICLES HAVING A SUBSTANTIAL NUMBER OF MACROPORES AND CONTAINING VANADIUM WHICH HAS BEEN COMBINED WITH THE PARTICLES PRIOR TO PROCESSING OF SAID HYDROCARBON FEEDSTOCK FOR VANDAIUM REMOVAL.
Inventors
- 👤 David S Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:26
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G2300/00; C10G2300/10; C10G2300/107
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |