US3259650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of carbonaceous materials in the presence of a non-alkaline medium to produce coal acids
Assignee: Dow Chemical Co
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Filing: 1963-11-12
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Granted: 1966-07-05
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Expires: 1983-11-12
Abstract
No abstract record available.
Inventors
- 👤 Dalton L Decker
- 👤 Mcmurtrie Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:22
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR THE PRODUCTION OF COAL ACIDS WHICH COMPRISES THE STEPS OF FORMING A NON-ALKALINE, AQUEOUS SLURRY CONTAINING FROM ABOUT 2 TO ABOUT 50 PERCENT BY WEIGHT OF A FINELY DIVIDED CARBONACEOUS MATERIAL, VIGOROUSLY AGITATING THE SLURRY SO AS TO ACHIEVE REYNOLDS NUMBERS OF AT LEAST 20,000 THEREIN AND SIMULTANEOUSLY THEREWITH, WHILE MAINTAINING THE TEMPERATURE OF THE SLURRY AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 240*TO ABOUT 320*C., AND UNDER AUTOGENOUS PRESSURE, CONTACTING THE NON-ALKALINE SLURRY WITH OXYGEN IN AN AMOUNT OF FROM ABOUT 1.5 TO ABOUT 4.0 TIMES THE WEIGHT OF CARBONACEOUS MATERIAL PRESENT FOR A PERIOD OF TIME FROM ABOUT 4 TO 30 MINUTES, WHEREBY COAL ACIDS ARE PRODUCED.
Claim 2
Dependent Claim
113 words
A PROCESS FOR THE PRODUCTION OF COAL ACIDS WHICH COMPRISES THE STEPS OF FORMING A NON-ALKALINE, AQUEOUS SLURRY CONTAINING FROM ABOUT 2 TO ABOUT 50 PERCENT BY WEIGHT OF A FINELY DIVIDED CARBONACEOUS MATERIAL, VIGOROUSLY AGITATING THE SLURRY SO AS TO ACHIEVE REYNOLDS NUMBERS OF AT LEAST 20,000 THEREIN AND SIMULTANEOUSLY THEREWITH, WHILE MAINTAINING THE TEMPERATURE OF THE SLURRY AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 240*TO ABOUT 320*C., AND UNDER AUTOGENOUS PRESSURE, CONTACTING THE NON-ALKALINE SLURRY WITH OXYGEN IN AN AMOUNT OF FROM ABOUT 1.5 TO ABOUT 4.0 TIMES THE WEIGHT OF CARBONACEOUS MATERIAL PRESENT FOR A PERIOD OF TIME FROM ABOUT 4 TO 30 MINUTES, WHEREBY COAL ACIDS ARE PRODUCED.
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) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |