US2840526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion prevention
Assignee: Union Oil Company of California
•
Filing: 1957-04-01
•
Granted: 1958-06-24
•
Expires: 1977-04-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard F Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:43
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/144; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE METHOD FOR REDUCING THE CORROSIVENESS OF OIL AND GAS WELL FLUIDS COMPRISING MOISTURE AND AT LEAST ONE ACIDIC MATERIAL SELECTED FROM THE CLASS CONSISTING OF CARBON DIOXIDE AND HYDROGEN SULFIDE TOWARDS FERROUS METALS WHICH COMPRISES INTRODUCING INTO SAID WELL FLUID A CORROSION INHIBITING AMOUNT OF A PRODUCT PREPARED BY REACTING AN ETHYLENE POLYAMINE OF THE GENERAL FORMULA
Claim 2
Independent Claim
58 words
THE METHOD FOR REDUCING THE CORROSIVENESS OF OIL AND GAS WELL FLUIDS COMPRISING MOISTURE AND AT LEAST ONE ACIDIC MATERIAL SELECTED FROM THE CLASS CONSISTING OF CARBON DIOXIDE AND HYDROGEN SULFIDE TOWARDS FERROUS METALS WHICH COMPRISES INTRODUCING INTO SAID WELL FLUID A CORROSION INHIBITING AMOUNT OF A PRODUCT PREPARED BY REACTING AN ETHYLENE POLYAMINE OF THE GENERAL FORMULA
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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |