US3278401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating tin-containing surfaces
Assignee: National Steel Corp
•
Filing: 1966-01-12
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Granted: 1966-10-11
•
Expires: 1986-01-12
Abstract
No abstract record available.
Inventors
- 👤 John R Smith
- 👤 Anthony J Lamantia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:27
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD OF TREATING MATERIAL HAVING A TIN-CONTAINING SURFACE TO IMPROVE THE CORROSION RESISTANCE OF SAID SURFACE, COMPRISING MAKING THE MATERIAL A CATHODE IN AN AQUEOUS HEXAVALENT CHROMIUM ELECTROLYTE CONSISTING ESSENTIALLY OF ABOUT 1-10 OUNCES PER GALLON OF A WATER SOLUBLE CHROMATIC AND A SMALL BUT EFFECTIVE AMOUNT NOT LESS THAN ABOUT 0.1 OUNCE PER GALLON OF A SUBSTANCE SELECTED FROM THE CLASS CONSISTING OF ACETIC ACID AND WATER SOLUBLE ACETATES OF WHICH THE CATIONS WILL NOT DEPOSIT AT THE CATHODE UNDER THE PROCESS CONDITIONS, AND PASSING AN ELECTRIC CURRENT THROUGH THE MATERIAL AND THE ELECTROLYTE UNTIL A CHROMIUM-CONTAINING FILM IS ADDED TO SAID SURFACE IN AN AMOUNT SUFFICIENT TO IMPROVE THE CORROSION RESISTANCE OF THE MATEERIAL, SAID SUBSTANCE BEING EFFECTIVE TO REDUCE SUBSTANTIALLY THE QUANTITY OF CURRENT NECESSARY TO ACHIEVE SAID CORROSION RESISTANCE.
Claim 2
Independent Claim
134 words
A METHOD OF TREATING MATERIAL HAVING A TIN-CONTAINING SURFACE TO IMPROVE THE CORROSION RESISTANCE OF SAID SURFACE, COMPRISING MAKING THE MATERIAL A CATHODE IN AN AQUEOUS HEXAVALENT CHROMIUM ELECTROLYTE CONSISTING ESSENTIALLY OF ABOUT 1-10 OUNCES PER GALLON OF A WATER SOLUBLE CHROMATIC AND A SMALL BUT EFFECTIVE AMOUNT NOT LESS THAN ABOUT 0.1 OUNCE PER GALLON OF A SUBSTANCE SELECTED FROM THE CLASS CONSISTING OF ACETIC ACID AND WATER SOLUBLE ACETATES OF WHICH THE CATIONS WILL NOT DEPOSIT AT THE CATHODE UNDER THE PROCESS CONDITIONS, AND PASSING AN ELECTRIC CURRENT THROUGH THE MATERIAL AND THE ELECTROLYTE UNTIL A CHROMIUM-CONTAINING FILM IS ADDED TO SAID SURFACE IN AN AMOUNT SUFFICIENT TO IMPROVE THE CORROSION RESISTANCE OF THE MATEERIAL, SAID SUBSTANCE BEING EFFECTIVE TO REDUCE SUBSTANTIALLY THE QUANTITY OF CURRENT NECESSARY TO ACHIEVE SAID CORROSION RESISTANCE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |