US2940927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for and method of inhibiting corrosion of metals
Assignee: Cities Service Research and Development Co
•
Filing: 1955-12-12
•
Granted: 1960-06-14
•
Expires: 1975-12-12
Abstract
No abstract record available.
Inventors
- 👤 William B Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:24
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/04; C07D233/06; C07D233/08; C07D233/12; C07D233/16; 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
132 words
THE METHOD OF INHIBITING CORROSION OF FERROUS METAL IN OIL AND GAS WELLS AND ASSOCIATED EQUIPMENT BY ADDING TO THE CORROSIVE FLUIDS PRESENT THEREIN A SMALL BUT SUFFICIENT QUANTITY OF THE FINAL REACTION PRODUCT OBTAINED BY FIRST CONDESING 2 MOLS OF A POLYAMINE SELECTED FROM THE GROUP CONSISTING OF TETRAETHYLENE PENTAMINE, TRIETHYLENE TETRAMINE, DIETHYLENE TRIAMINE, AND ETHYLENE DIAMINE WITH 1 MOL OF A DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF AN ACID HAVING FROM 4 TO 20 CARBON ATOMS AND DIMERIZED LINOLEIC ACID UNDER CONDITONS WHICH PERMIT REMOVAL OF 4 MOLS OF WATER FROM THE REACTION MIXTURE TO PROVIDE AN INTERMEDIATE BIS-IMIDAZOLINE REACTION PRODUCT, INTRODUCING INTO THE INTERMEDIATE REACTION PRODUCTION FROM 1 TO 4 MOLS OF ETHYLENE OXIDE AND PASSING THE CORROSIVE FLUIDS IN CONTACT WITH THE METAL TO BE PROTECTED.
Claim 2
Independent Claim
132 words
THE METHOD OF INHIBITING CORROSION OF FERROUS METAL IN OIL AND GAS WELLS AND ASSOCIATED EQUIPMENT BY ADDING TO THE CORROSIVE FLUIDS PRESENT THEREIN A SMALL BUT SUFFICIENT QUANTITY OF THE FINAL REACTION PRODUCT OBTAINED BY FIRST CONDESING 2 MOLS OF A POLYAMINE SELECTED FROM THE GROUP CONSISTING OF TETRAETHYLENE PENTAMINE, TRIETHYLENE TETRAMINE, DIETHYLENE TRIAMINE, AND ETHYLENE DIAMINE WITH 1 MOL OF A DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF AN ACID HAVING FROM 4 TO 20 CARBON ATOMS AND DIMERIZED LINOLEIC ACID UNDER CONDITONS WHICH PERMIT REMOVAL OF 4 MOLS OF WATER FROM THE REACTION MIXTURE TO PROVIDE AN INTERMEDIATE BIS-IMIDAZOLINE REACTION PRODUCT, INTRODUCING INTO THE INTERMEDIATE REACTION PRODUCTION FROM 1 TO 4 MOLS OF ETHYLENE OXIDE AND PASSING THE CORROSIVE FLUIDS IN CONTACT WITH THE METAL TO BE PROTECTED.
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |