US2877188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibitors and method of using same
Assignee: Hagan Chemicals and Controls Inc
•
Filing: 1956-07-27
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Granted: 1959-03-10
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Expires: 1976-07-27
Abstract
No abstract record available.
Inventors
- 👤 Robert W Liddell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:07
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A CORROSION INHIBITOR CONSISTING ESSENTIALLY OF (A) ALKALI METAL NITRITE (B) A MILDLY ALKALINE SALTS, AND (C) BENZOTRIAZOLE, THE RATIO OF (A) TO (B) BEING FROM ABOUT 9 TO 1 TO ABOUT 1 TO 4 AND (C) BEING PRESENT IN AN AMOUNT WHICH IS FROM ABOUT 0.1 PERCENT TO ABOUT 2.0 PERCENT OF THE TOTAL WEIGHT OF THE INHIBITOR MIXTURE.
Claim 2
Dependent Claim
60 words
A CORROSION INHIBITOR CONSISTING ESSENTIALLY OF (A) ALKALI METAL NITRITE (B) A MILDLY ALKALINE SALTS, AND (C) BENZOTRIAZOLE, THE RATIO OF (A) TO (B) BEING FROM ABOUT 9 TO 1 TO ABOUT 1 TO 4 AND (C) BEING PRESENT IN AN AMOUNT WHICH IS FROM ABOUT 0.1 PERCENT TO ABOUT 2.0 PERCENT OF THE TOTAL WEIGHT OF THE INHIBITOR MIXTURE.
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) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |