US2863780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibition of corrosion of iron in acids
Assignee: West Virginia Pulp and Paper Co
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Filing: 1957-03-04
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Granted: 1958-12-09
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Expires: 1977-03-04
Abstract
No abstract record available.
Inventors
- 👤 Jr John Corning Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:28
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/04; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
A PROCESS FOR INHIBITING THE CORROSION OF IRON IN ACID SOLUTION, WHICH CONSISTS ESSENTIALLY IN THE ADDITION TO THE ACID SOLUTION OF A SMALL AMOUNT OF A LIGNIN AMINE SUFFICIENT TO EFFECT A SUBSTANTIAL MEASURE OF CORROSION INHIBITION, SAID LIGNIN AINE BEING PREPARED BY THE REACTION OF THE FOLLOWING INGREDIENTS: (A) AN INGREDIENT CHOSEN FROM THE GROUP CONSISTING OF LIGNIN, SULFONATED LIGNIN AND ALKALI METAL SALTS OF LIGNIN AND SULFONATED LIGNIN, (B) AN ALDEHYDE, AND (C) AN AMINE CHOSEN FROM THE GROUP CONSISTING OF THE PRIMARY AND SECONDARY AMINES, AND MAINTAINING THE SO MODIFIED ACID SOLUTION IN CONTACT WITH IRON.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |