US2617713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inhibiting corrosion of steel by alkali solutions
Assignee: Pure Oil Co
•
Filing: 1948-04-15
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Granted: 1952-11-11
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Expires: 1968-04-15
Abstract
No abstract record available.
Inventors
- 👤 George W Ayers
- 👤 Erskine E Harton
- 👤 Louis R Mazurk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:14
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
IN THE METHOD OF REGENERATING SPENT CAUSTIC ALKALI EXTRACTION SOLUTION WHEREIN SAID REGENERATION IS CARRIED OUT AT AN ELEVATED TEMPERATURE WHICH IS SUBSTANTIALLY THE BOILING POINT OF THE SOLUTION, SAID SOLUTION HAVING BEEN EMPLOYED IN REMOVING SLIGHTLY ACIDIC SULFUR COMPOUNDS FROM HYDROCARBON MIXTURES AND CONTAINING 5 TO 50% BY WEIGHT OF A CAUSTIC ALKALI SELECTED FROM THE GROUP CONSISTING OF THE HYDROXIDES OF SODIUM AND POTASSIUM, THE PROTECTION OF FERROUS METAL SURFACES CONTACTED BY SAID SOLUTION BY INCLUDING THEREIN AS A CORROSION INHIBITING MATERIAL AN ALKALI METAL THIOSULFATE IN AN AMOUNT BETWEEN 0.001 TO 5% BY WEIGHT.
Claim 2
Dependent Claim
97 words
IN THE METHOD OF REGENERATING SPENT CAUSTIC ALKALI EXTRACTION SOLUTION WHEREIN SAID REGENERATION IS CARRIED OUT AT AN ELEVATED TEMPERATURE WHICH IS SUBSTANTIALLY THE BOILING POINT OF THE SOLUTION, SAID SOLUTION HAVING BEEN EMPLOYED IN REMOVING SLIGHTLY ACIDIC SULFUR COMPOUNDS FROM HYDROCARBON MIXTURES AND CONTAINING 5 TO 50% BY WEIGHT OF A CAUSTIC ALKALI SELECTED FROM THE GROUP CONSISTING OF THE HYDROXIDES OF SODIUM AND POTASSIUM, THE PROTECTION OF FERROUS METAL SURFACES CONTACTED BY SAID SOLUTION BY INCLUDING THEREIN AS A CORROSION INHIBITING MATERIAL AN ALKALI METAL THIOSULFATE IN AN AMOUNT BETWEEN 0.001 TO 5% BY WEIGHT.
References Cited (Backward Citations)
US1957268A
Cited
US2468701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |