Patent US4631384A successfully refreshed from Google Patents.
US4631384A
Expired / Lapsed
US
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Bitumen combustion process
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1984-02-13
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Granted: 1986-12-23
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Expires: 2004-02-13
Abstract
Abstract Process for the combustion of bitumen, wherein the bitumen is softened by preheating and is then introduced into a combustion chamber, traversed by oxygen in excess subject to ionization by an intense ultra-high frequency field, so as to raise the surface of the bitumen to a temperature above 1000° C., thereby ensuring its vaporization and rapid combustion in the thus produced oxygen plasma.
Inventors
- 👤 Ayme Cornu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:41
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/08; F23G5/085; F23G7/00; G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; G21F9/32; F23G2204/00; F23G2204/20; F23G2204/201; F23G2209/00; F23G2209/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A process for the combustion of bitumen, wherein the bitumen is softened by preheating and is then introduced into a combustion chamber, traversed by an amount of oxygen and subjected to ionization by an intense ultra-high frequency field, said amount of oxygen being in excess of the quantity of oxygen necessary for combustion of the bitumen, so as to raise the surface of the bitumen to a temperature above 1000° C., thereby ensuring its vaporization and rapid combustion in the thus produced oxygen plasma.
Claim 2
Dependent Claim
84 words
A process for the combustion of bitumen, wherein the bitumen is softened by preheating and is then introduced into a combustion chamber, traversed by an amount of oxygen and subjected to ionization by an intense ultra-high frequency field, said amount of oxygen being in excess of the quantity of oxygen necessary for combustion of the bitumen, so as to raise the surface of the bitumen to a temperature above 1000° C., thereby ensuring its vaporization and rapid combustion in the thus produced oxygen plasma.
Claim 3
Dependent Claim
33 words
A bitumen combustion process according to claim 1, wherein a frequency preferably between 50 and 100 MHz and a power between 5 and 60 kW are preferably chosen for the UHF electric field.
Claim 4
Dependent Claim
106 words
A process for separating and recovering radioactive waste from bitumen comprising the steps of preheating the bitumen containing the radioactive waste and then introducing it into a combustion chamber traversed by an amount of oxygen and subjected to ionization by an intense ultra-high frequency field, said amount of oxygen being in excess of the quantity of oxygen necessary for combustion of the bitumen, so as to raise the surface of the bitumen containing the radioactive waste to a temperature above 1000° C., thereby ensuring vaporization and rapid combustion of bitumen in the thus produced oxygen plasma, the remaining radioactive waste being thus separated from the bitumen.
Claim 5
Dependent Claim
106 words
A process for separating and recovering radioactive waste from bitumen comprising the steps of preheating the bitumen containing the radioactive waste and then introducing it into a combustion chamber traversed by an amount of oxygen and subjected to ionization by an intense ultra-high frequency field, said amount of oxygen being in excess of the quantity of oxygen necessary for combustion of the bitumen, so as to raise the surface of the bitumen containing the radioactive waste to a temperature above 1000° C., thereby ensuring vaporization and rapid combustion of bitumen in the thus produced oxygen plasma, the remaining radioactive waste being thus separated from the bitumen.
Claim 6
Dependent Claim
31 words
The process according to claim 3, wherein a frequency preferably between 50 and 100 MHz and a power between 5 and 60 kW are preferably chosen for the UHF electric field.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |