US3705092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of coal by a heavy oil
Assignee: Universal Oil Products Co
•
Filing: 1970-12-18
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Granted: 1972-12-05
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Expires: 1990-12-18
Abstract
Abstract A SOLID CARBONACEOUS MATERIAL, SUCH AS COAL, IS CONVENTED TO LIQUID PRODUCTS AND THE ASPHALTENE CONTENT OF A HEAVY HYDROCARBONACEOUS LIQUID IS REDUCED IN A PROCESS WHEREIN THE SOLID IS SOLVENT EXTRACTED BY THE LIQUID AND THE RESULTANT MIXTURE OF LIQUIDS IS RECOVERED AS THE PRODUCT.
Inventors
- 👤 John G Gatsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:40
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/06; C10G1/065
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |