US2901439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion reduction
Assignee: ChampionX LLC
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Filing: 1956-10-03
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Granted: 1959-08-25
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Expires: 1976-10-03
Abstract
No abstract record available.
Inventors
- 👤 Jr John T Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:48
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD FOR PROTECTING MILD CARBON STEEL CONTAINERS AGAINST CORROSION BY CORROSIVE NITROGEN FERTILIZER SOLUTIONS COTAINED THEREIN WHICH COMPRISES ADDING TO SAID CONTAINERS SAID CORROSIVE SOLUTIONS 25-500 P.P.M. OF A CORROSION-INHIBITING COMPOSITION COMPOSED OF THE FOLLOWING INGREDIENTS EXPRESSED AS WEIGHT PERCENTAGES OF CORROSION-INHIBITING COMPOSITION, 15-70% SODIUM SULFITE, 0.01-1% OF A COBALT SALT, AND 1.35% LIGNIN DERIVATIVES SOLUBLE IN ALKALINE SOLUTIONS AND RESULTING FROM HYDROLYSIS IN CAUSTIC ALKALI OIF SODIUM LINGNIN SULFONATE AT A TEMPERATURE WITHIN THE RANGE OF 265* C. TO 325* C. UNDER SUPERATMOSPHERE PRESSURE FOR 30 TO 120 MINUTES.
Claim 2
Independent Claim
91 words
A METHOD FOR PROTECTING MILD CARBON STEEL CONTAINERS AGAINST CORROSION BY CORROSIVE NITROGEN FERTILIZER SOLUTIONS COTAINED THEREIN WHICH COMPRISES ADDING TO SAID CONTAINERS SAID CORROSIVE SOLUTIONS 25-500 P.P.M. OF A CORROSION-INHIBITING COMPOSITION COMPOSED OF THE FOLLOWING INGREDIENTS EXPRESSED AS WEIGHT PERCENTAGES OF CORROSION-INHIBITING COMPOSITION, 15-70% SODIUM SULFITE, 0.01-1% OF A COBALT SALT, AND 1.35% LIGNIN DERIVATIVES SOLUBLE IN ALKALINE SOLUTIONS AND RESULTING FROM HYDROLYSIS IN CAUSTIC ALKALI OIF SODIUM LINGNIN SULFONATE AT A TEMPERATURE WITHIN THE RANGE OF 265* C. TO 325* C. UNDER SUPERATMOSPHERE PRESSURE FOR 30 TO 120 MINUTES.
References Cited (Backward Citations)
US2505457A
Cited
US2613131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |