US3689240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of methane rich gases
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-03-18
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Granted: 1972-09-05
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Expires: 1991-03-18
Abstract
Abstract A PROCESS FOR PRODUCING A METHANE-RICH GAS WHEREIN CARBONACEOUS MATERIAL IS STEAM GASIFIED AT TEMPERATURES BETWEEN 1100 AND 1400* F. AND AT PRESSURES BETWEEN 200 AND 2000 P.S.I.G. WITH STEAM RATES BETWEEN 0.1 AND 1.0 WT. H2O/WT. CARBON/HR. IN THE PRESENCE OF AN ALKALI METAL SALT CATALYST COMPOSITION.
Inventors
- 👤 Clyde L Aldridge
- 👤 David Buben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:28
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/20; B01J27/232; C; C07; C07C; C07C1/00; C10; C10J; C10J3/00; C10J3/02; C10J3/06; C10J3/46; C10J3/463; C07C2521/00; C07C2521/02; C07C2521/04; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/10; C07C2527/20; C07C2527/232; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0933; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/50; Y02P20/52
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |