US2836558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inhibiting corrosion of metals
Assignee: Cities Service Research and Development Co
•
Filing: 1954-05-17
•
Granted: 1958-05-27
•
Expires: 1974-05-17
Abstract
No abstract record available.
Inventors
- 👤 William B Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:36
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
41 words
THE PROCESS OF REDUCING CORROSION OF METALS WHEN EXPOSED TO CORROSIVE OIL WELL BRINES WHICH COMPRISES INCORPORATING INTO CORROSIVE OIL WELL FLUIDS A SMALL BUT SUFFICIENT QUANTITY OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF HEXAHYDROPYRIMIDINES HAVING THE GENERIC FORMULA
Claim 2
Dependent Claim
41 words
THE PROCESS OF REDUCING CORROSION OF METALS WHEN EXPOSED TO CORROSIVE OIL WELL BRINES WHICH COMPRISES INCORPORATING INTO CORROSIVE OIL WELL FLUIDS A SMALL BUT SUFFICIENT QUANTITY OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF HEXAHYDROPYRIMIDINES HAVING THE GENERIC FORMULA
References Cited (Backward Citations)
US2640029A
Cited
US2675381A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |