US2593128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for sulfuric acid recovery
Assignee: California Research LLC
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Filing: 1948-05-06
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Granted: 1952-04-15
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Expires: 1968-05-06
Abstract
No abstract record available.
Inventors
- 👤 Richard H Felter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:51
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/90; C01B17/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE METHOD OF TREATING SULFURIC ACID SLUDGES FORMED IN THE TREATMENT OF PETROLEUM FRACTIONS WITH CONCENTRATED SULFURIC ACID AND CHARACTERIZED BY A SULFURIC ACID CONTENT ABOVE ABOUT 80% BY WEIGHT AND BY A WEIGHT RATIO OF SUFURIC ACID TO WATER ABOVE 93:7 WHICH COMPRISES COOLING THE SLUDGE TO A TEMPERATURE BETWEEN ABOUT 0* F. AND 30* F. TO PRODUCE A SOLID PHASE COMPRISING CONCENTRATED SULFURIC ACID HAVING A CONCENTRATION GREATER THAN 93 PER CENT AND A LIQUID PHASE AND THEREAFTER SEPARATING THE PHASES.
Claim 2
Independent Claim
83 words
THE METHOD OF TREATING SULFURIC ACID SLUDGES FORMED IN THE TREATMENT OF PETROLEUM FRACTIONS WITH CONCENTRATED SULFURIC ACID AND CHARACTERIZED BY A SULFURIC ACID CONTENT ABOVE ABOUT 80% BY WEIGHT AND BY A WEIGHT RATIO OF SUFURIC ACID TO WATER ABOVE 93:7 WHICH COMPRISES COOLING THE SLUDGE TO A TEMPERATURE BETWEEN ABOUT 0* F. AND 30* F. TO PRODUCE A SOLID PHASE COMPRISING CONCENTRATED SULFURIC ACID HAVING A CONCENTRATION GREATER THAN 93 PER CENT AND A LIQUID PHASE AND THEREAFTER SEPARATING THE PHASES.
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) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |