US3709931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation process employing nitric acid catalysis for the preparation of humates from coal
Assignee: American Hydrocarbon Co
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Filing: 1968-10-09
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Granted: 1973-01-09
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Expires: 1988-10-09
Abstract
Abstract AN OXIDATION PROCESS EMPOLYING NITRIC ACID CATALYSIS FOOR THE PREPARATION OF HUMATES AND OTHER ORGANIC CHEMICALS FROM COL. THE PROCESS COMPRISES THE STEP OF NITRODUCING OXYGEN AND A CATALYTIC AMOUNT OF NITRIC ACID INTO A REACTOR CONTAINING A PULVERIZED COAL, TO WHICH 5% TO 35% OF MOISTURE AND 25% OF THE TOTAL AMOUNT OF NITRIC ACID TO BE EMPLOYED HAS BEEN ADMIXED, MAINTAINING THE TEMPERSTURE OF THIS REACTOR AT BETWEEN ABOUT 150* F. TO ANOUT 225* F., TERMINATING THE REACTION WITHIN AT LEAST TEN HOURS AND RECOVERING HUNATES AND OTHER ORGANIC CHEMICALS.
Inventors
- 👤 W Proell
- 👤 C Selin
- 👤 S Holbrook
- 👤 F Hammond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:31
CPC Classifications
C; C08; C08H; C08H99/00; C05; C05F; C05F11/00; C05F11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |