Patent US3647650A successfully refreshed from Google Patents.
US3647650A
Expired / Lapsed
US
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Method of treating tin plate or galvanized sheet
Assignee: JFE Engineering Corp
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Filing: 1969-07-16
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Granted: 1972-03-07
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Expires: 1989-07-16
Abstract
Abstract A PROCESS FOR MAKING TIN PLATE OR GALVANIZED SHEET WHICH COMPRISES SUBJECTING THE ELECTROLYTICALLY PLATED SHEET FIRST TO POST-TREATMENT WITH AN ALKALINE SOLUTION, THEN WASHING THE SHEET WITH WATER, AND THEREAFTER SUBJECTING IT TO AN ELECTROLYTIC PASSIVATING TREATMENT IN A SOLUTION CONTAINING (A) A HEXAVALENT CHROMIUM IONS-FURNISHING COMPOUND AND (B) A WATER-SOLUBLE SATURATED CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF MONOBASIC FATTY ACIDS, DIBASIC FATTY ACIDS, AROMATIC CARBOXYLIC ACIDS, SALTS OF SUCH ACIDS AND MIXTURES OF SUCH ACID OR SALTS. SHEETS WITH IMPROVED RESISTANCE AGAINST CORROSION AND OXIDATION ARE OBTAINED.
Inventors
- 👤 Hidehisa Yamagishi
- 👤 Naoki Gunji
- 👤 Masao Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:08
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |