US2643978A
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: 1953-06-30
•
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
2026-10-25 21:05
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
114 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 THE REACTION PRODUCT PREPARED BY FIRST SPONTANEOUSLY REACTING A POLYETHYLENEAMINE SELECTED FROM THE GROUP CONSISTING OF TRIETHYLENETETRAMINE AND TETRAETHYLENEPENTAMINE WITH AN APPROXIMATELY EQUIMOLAR QUANTITY OF AN ALDEHYDE TO FORM AN INTERMEDIATE REACTION PRODUCT DISTILLING WATER FORMED IN THE REACTION FROM THE MIXTURE, SPONTANEOUSLY REACTING THE SAID INTERMEDIATE REACTION PRODUCT WITH A SECOND APPROXIMATELY EQUIMOLAR QUANTITY OF AN ALDEHYDE AND DISTILLING WATER FORMED IN THE REACTION FROM THE REACTION PRODUCT, AND THEREAFTER CAUSING THE SAID WELL FLUIDS TO FLOW IN CONTACT WITH THE METAL TO BE PROTECTED.
Claim 2
Dependent Claim
114 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 THE REACTION PRODUCT PREPARED BY FIRST SPONTANEOUSLY REACTING A POLYETHYLENEAMINE SELECTED FROM THE GROUP CONSISTING OF TRIETHYLENETETRAMINE AND TETRAETHYLENEPENTAMINE WITH AN APPROXIMATELY EQUIMOLAR QUANTITY OF AN ALDEHYDE TO FORM AN INTERMEDIATE REACTION PRODUCT DISTILLING WATER FORMED IN THE REACTION FROM THE MIXTURE, SPONTANEOUSLY REACTING THE SAID INTERMEDIATE REACTION PRODUCT WITH A SECOND APPROXIMATELY EQUIMOLAR QUANTITY OF AN ALDEHYDE AND DISTILLING WATER FORMED IN THE REACTION FROM THE REACTION PRODUCT, AND THEREAFTER CAUSING THE SAID WELL FLUIDS TO FLOW IN CONTACT WITH THE METAL TO BE PROTECTED.
References Cited (Backward Citations)
US1771965A
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) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |