US2646400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inhibiting corrosion of metals
Assignee: Cities Service Research and Development Co
•
Filing: 1951-02-24
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Granted: 1953-07-21
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Expires: 1971-02-24
Abstract
No abstract record available.
Inventors
- 👤 William B Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:54
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE PROCESS OF REDUCING CORROSION OF METALS WHEN EXPOSED TO CORROSIVE OIL WELL BRINES WHICH COMPRISES INCORPORATING IN CORROSIVE OIL WELL FLUIDS A SMALL BUT SUFFICIENT QUANTITY OF A COMPOUND PREPARED BY REACTING APPROXIMATELY EQUIMOLAR QUANTITIES OF A POLYETHYLENEAMINE SELECTED FROM THE GROUP CONSISTING OF TRIETHYLENETETRAMINE AND TETRAETHYLENEPENTAMINE WITH AN ALDEHYDE CONTAINING MORE THAN ONE CARBON ATOM, AT TEMPERATURES BELOW THE BOILING POINT OF THE REACTANTS, AND THEREAFTER HEATING THE REACTION MIXTURE AT TEMPERATURES ABOVE 100* C. TO DRIVE OFF WATER FORMED IN THE REACTION AND THEREAFTER CAUSING THE WELL FLUIDS TO FLOW IN CONTACT WITH THE METAL TO BE PROTECTED.
Claim 2
Dependent Claim
101 words
THE PROCESS OF REDUCING CORROSION OF METALS WHEN EXPOSED TO CORROSIVE OIL WELL BRINES WHICH COMPRISES INCORPORATING IN CORROSIVE OIL WELL FLUIDS A SMALL BUT SUFFICIENT QUANTITY OF A COMPOUND PREPARED BY REACTING APPROXIMATELY EQUIMOLAR QUANTITIES OF A POLYETHYLENEAMINE SELECTED FROM THE GROUP CONSISTING OF TRIETHYLENETETRAMINE AND TETRAETHYLENEPENTAMINE WITH AN ALDEHYDE CONTAINING MORE THAN ONE CARBON ATOM, AT TEMPERATURES BELOW THE BOILING POINT OF THE REACTANTS, AND THEREAFTER HEATING THE REACTION MIXTURE AT TEMPERATURES ABOVE 100* C. TO DRIVE OFF WATER FORMED IN THE REACTION AND THEREAFTER CAUSING THE WELL FLUIDS TO FLOW IN CONTACT WITH THE METAL TO BE PROTECTED.
References Cited (Backward Citations)
US1771985A
Cited
US2426318A
Cited
US2496596A
Cited
US2596273A
Cited
US2466517A
Cited
US2468163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |