Patent US3790467A successfully refreshed from Google Patents.
US3790467A
Expired / Lapsed
US
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Coal liquefaction solids removal
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1972-04-24
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Granted: 1974-02-05
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Expires: 1992-04-24
Abstract
Abstract SOLID RESIDUES ARE MORE EFFECTIVELY SEPARATED FROM A COAL EXTRACT ENRICHED SOLVENT OF A COAL LIQUEFACTION PRODUCT, IN A SOLIDS-LIQUIDS SEPARATION ZONE IN WHICH SOLIDS SIZE IS A SEPARTION PARAMETER, BY ADDING TO THE COAL LIQUEFACTION PRODUCT A COAL EXTRACT LIQUID DERIVED FROM THE COAL LIQUEFACTION PRODUCT AND CONTAINING AT LEAST 20 VOLUME PERCENT OF MATERIALS BOILING BELOW ABOUT 400* F. OR AT LEAST 20 VOLUME PERCENT OF MATERIALS BOILING ABOVE ABOUT 1000* F.
Inventors
- 👤 R Fiocco
- 👤 E Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:51
CPC Classifications
C; C10; C10G; C10G47/00; C10G1/00; C10G1/002; C10G1/006; C10G1/04; C10G1/045
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |