US2918390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition
Assignee: Pennwalt Corp
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Filing: 1957-03-08
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Granted: 1959-12-22
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Expires: 1977-03-08
Abstract
No abstract record available.
Inventors
- 👤 Lewis J Brown
- 👤 Spring Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:24
CPC Classifications
C; C23; C23F; C23F11/00; C23C; C23C22/00; C23C22/82; C23C22/83; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE METHOD OF PREVENTING WHITE RUST ON GALVANIZED STOCK COMPRISING CATHODICALLY CLEANING THE STOCK IN ALKALI, RINSING OFF THE ENTRAINED ALKALI, APPLYING A 0.01 TO 1% SOLUTION OF A FATTY AMINE SALT THEREBY DEPOSITING A HYDROPHOBIC FATTY AMINE SALT LAYER ON THE BARE META, AND THEN APPLYING A 0.05 TO 0.5% SOLUTION OF A HEXAVALENT CHROMIUM COMPOUND DIRECTLY TO SAID FATTY AMINE SALT LAYER, SALT HAVING THE FORMULAR-NH3X WHEREIN R IS AN ALKYL GROUP HAVING AT LEAST 8 CARBON ATOMS AND X IS AN ANION OF THE GROUP CONSISTING OF ACETATE, LACTATE AND CHLORIDE.
Claim 2
Independent Claim
94 words
THE METHOD OF PREVENTING WHITE RUST ON GALVANIZED STOCK COMPRISING CATHODICALLY CLEANING THE STOCK IN ALKALI, RINSING OFF THE ENTRAINED ALKALI, APPLYING A 0.01 TO 1% SOLUTION OF A FATTY AMINE SALT THEREBY DEPOSITING A HYDROPHOBIC FATTY AMINE SALT LAYER ON THE BARE META, AND THEN APPLYING A 0.05 TO 0.5% SOLUTION OF A HEXAVALENT CHROMIUM COMPOUND DIRECTLY TO SAID FATTY AMINE SALT LAYER, SALT HAVING THE FORMULAR-NH3X WHEREIN R IS AN ALKYL GROUP HAVING AT LEAST 8 CARBON ATOMS AND X IS AN ANION OF THE GROUP CONSISTING OF ACETATE, LACTATE AND CHLORIDE.
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) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |