US3568403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of solids from flue gas
Assignee: Chemical Construction Corp
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Filing: 1966-06-21
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Granted: 1971-03-09
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Expires: 1986-06-21
Abstract
Abstract IMPROVED ELECTROSTATIC PRECIPITATION OF ENTRAINED SOLIDS FROM FLUE GAS, WHICH IS GENERATED BY BURNING SULFUR-CONTAINING SOLID CARBONACEOUS FUEL, IS ATTAINED BY BURNING A VANADIUM-CONTAINING LIQUID HYDROCARBON SUCH AS HIGH VANADIUM CONTENT CRUDE OIL OR REFINRY RESIDUAL OIL TOGETHER WITH THE SOLID FUEL. THE VANADIUM WHICH IS THUS ADDED TO THE COMBUSTION PROCESS IS CONVERTED TO VANADIUM PENTOXIDE WHICH CAUSES AT LEAST PARTIAL CATALYTIC OXIDATION OF SULFUR DIOXIDE TO SULFUR TRIOXIDE, WHICH PROVIDES IMPROVED RESULTS AND GREATER EFFICIENCY DURING SUBSEQUENT TREATMENT OF THE FLUE GAS BY ELECTROSTATIC PRECIPITATION, IN TERMS OF GREATER SOLIDS REMOVAL FROM THE FLUE GAS.
Inventors
- 👤 Harry L Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:34
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/01; B03C3/013
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |