US3138548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tin plate treatment
Assignee: Inland Steel Co
•
Filing: 1961-04-11
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Granted: 1964-06-23
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Expires: 1981-04-11
Abstract
No abstract record available.
Inventors
- 👤 Coy S Ham
- 👤 Jack E Joyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:23
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/38; C25D5/00; C25D5/48; Y; Y10; Y10S; Y10S205/00; Y10S205/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
A METHOD OF TREATING TIN PLATE SO AS TO PROVIDE IMPROVED LACQUER ADHERENT SURFACE CHARACTERISTICS WHICH COMPRISES IN COMBINATION THE STEPS OF MAKING THE TIN PLATE THE CATHODE WHILE IMMERSED IN A HOT AQUEROUS ALKALINE CLEANING ELECTROLYTE AND PASSING AN ELECTRIC CURRENT THROUGH SAID ELECTROLYTE AND TIN PLATE TO REMOVE SUBSTANTIALLY ALL SURFACE OXIDES AND OTHER CONTAMINATION THEREON WITHOUT REMOVING TIN, WASHING SAID TIN PLATE WITH WATER AFTER IT IS WITHDRAWIN FROM SAID ALKALINE CLEANING ELECTROLYTE TO RINSE AWAY MOST OF SAID ALKALINE CLEANING ELECTROLYTE REMAINING ON THE SURFACE THEREOF, THEREAFTER APPLYING TO SAID TIN PLATE AFTER WASHING WITH WATER AND BEFORE SUBJECTING TO ELECTROLYTIC TREATMENT WITH A CHROMINUM CONTAINING SOLUTION AN ACIT CONDITIONING SOLUTION COMPRISING A HOT DILUTE AQUEOUS ACID SOLUTION HAVING A PH BETWEEN ABOUT PH 4 AND 6, AND DIRECTLY PASSIVATING THE ACID CONDITIONED TIN PLATE SURFACE BY MAKING SAID TIN PLATE THE CATHODE WHILE IMMERSING IN A HOT AQUEOUS HEXAVALENT CHROMIUM CONTAINING ELECTROLYTE HAVING A PH BETWEEN ABOUT PH 4 AND 6 WHILE PASSING AN ELECTRIC CURRENT. THROUGH SAID CHROMIUM CONTAINING ELECTROLYTE AND TIN PLATE TO PROVIDE A PASSIVE NONOXIDING SURFACE ON SAID TIN PLATE, WHEREBY A TIN PLATE HAVING SUBSTANTIALLY IMPROVED LACQUER ADHERENT SURFACE CHARACTERISTICS IS PROVIDED.
Claim 2
Independent Claim
202 words
A METHOD OF TREATING TIN PLATE SO AS TO PROVIDE IMPROVED LACQUER ADHERENT SURFACE CHARACTERISTICS WHICH COMPRISES IN COMBINATION THE STEPS OF MAKING THE TIN PLATE THE CATHODE WHILE IMMERSED IN A HOT AQUEROUS ALKALINE CLEANING ELECTROLYTE AND PASSING AN ELECTRIC CURRENT THROUGH SAID ELECTROLYTE AND TIN PLATE TO REMOVE SUBSTANTIALLY ALL SURFACE OXIDES AND OTHER CONTAMINATION THEREON WITHOUT REMOVING TIN, WASHING SAID TIN PLATE WITH WATER AFTER IT IS WITHDRAWIN FROM SAID ALKALINE CLEANING ELECTROLYTE TO RINSE AWAY MOST OF SAID ALKALINE CLEANING ELECTROLYTE REMAINING ON THE SURFACE THEREOF, THEREAFTER APPLYING TO SAID TIN PLATE AFTER WASHING WITH WATER AND BEFORE SUBJECTING TO ELECTROLYTIC TREATMENT WITH A CHROMINUM CONTAINING SOLUTION AN ACIT CONDITIONING SOLUTION COMPRISING A HOT DILUTE AQUEOUS ACID SOLUTION HAVING A PH BETWEEN ABOUT PH 4 AND 6, AND DIRECTLY PASSIVATING THE ACID CONDITIONED TIN PLATE SURFACE BY MAKING SAID TIN PLATE THE CATHODE WHILE IMMERSING IN A HOT AQUEOUS HEXAVALENT CHROMIUM CONTAINING ELECTROLYTE HAVING A PH BETWEEN ABOUT PH 4 AND 6 WHILE PASSING AN ELECTRIC CURRENT. THROUGH SAID CHROMIUM CONTAINING ELECTROLYTE AND TIN PLATE TO PROVIDE A PASSIVE NONOXIDING SURFACE ON SAID TIN PLATE, WHEREBY A TIN PLATE HAVING SUBSTANTIALLY IMPROVED LACQUER ADHERENT SURFACE CHARACTERISTICS IS PROVIDED.
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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |