US3211673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of active char by solvent extraction of coal and activation of the residue
Assignee: Pacific Power and Light Co
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Filing: 1961-12-26
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Granted: 1965-10-12
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Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Horace E Luntz
- 👤 Frederick W Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:53
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/336
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
A PROCESS OF PRODUCING ACTIVATED PARTICULATE CARBONACEOUS MATERIAL WHICH COMPRISES: SUBJECTING COAL PARTICLES TO A SOLVENT EXTRACTION OPERATION WHEREIN AN ORGANIC GAS OIL SOVENT IS CONTACTE WITH THE COAL PARTICLES AT A TEMPERATURE IN THE RANGE OF 500*F. TO 800*F. AND A PRESSURE SUFFICIENT TO MAINTAIN AT LEAST A SUBSTANTIAL AMOUNT OF TH SOLVENT IN THE LIQUID STATE AND FRO A TIME SUFFICIENT TO EXTRACT UP TO ABOUT 50 WEIGHT PERCENT OF THE COAL; REMOVING RESIDUAL SOLVENT AND EXTRACT FROM THE COAL RESIDUE; AND ACTIVATING A PORTION OF THE COAL RESIDUE PARTICLES BY CONTACTING SAID PORTION WITH AN OXIDIZING GAS AT A TEMPERATURE OF BETWEEN 550%F. AND 2000*F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |