US3558468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of extracting materials
Assignee: Coal Industry Patents Ltd
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Filing: 1969-06-13
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Granted: 1971-01-26
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Expires: 1989-06-13
Abstract
Abstract A CARBONACEOUS MATERIAL E.G. COAL OR C OAL TAR, IS TREATED WITH A FLUID E.G. BENZENE OR ETHYLENE RESPECTIVELY, AT SUPERCRITICAL CONDITIONS TO EXTRACT PART OR ALL OF THE CARBONACEOUS CONTENT WHICH IS SUBSEQUENTLY RELEASED BY REDUCING THE PRESSURE.
Inventors
- 👤 William S D Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:56
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0203; C; C10; C10G; C10G1/00; C10G1/04; C10L; C10L5/00; C10L5/02; C10L5/04; C10L9/00; C10L2290/00; C10L2290/54; C10L2290/544; Y; Y10; Y10S; Y10S208/00; Y10S208/952; Y10S264/00; Y10S264/19
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |