Patent US3304246A successfully refreshed from Google Patents.
US3304246A
Expired / Lapsed
US
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Method of electrolytically descaling steel including selective recovery of dissolved scale products
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1964-12-16
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Granted: 1967-02-14
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Expires: 1984-12-16
Abstract
No abstract record available.
Inventors
- 👤 Fukui Saburo
- 👤 Yamamoto Masato
- 👤 Tao Kozo
- 👤 Hasegawa Shigeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:15
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/36; C25; C25F; C25F1/00; C25F1/02; C25F1/04; C25F1/06; C25F7/00; C25F7/02; Y; Y10; Y10S; Y10S423/00; Y10S423/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
IN A METOD OF ELECTROLYTICALLY DESCALING NICKEL AND CHROMIUM CONTAINING STEEL, WHEREIN THE ELECTROLYSIS IS CARRIED OUT IN AN ELECTROLYTIC BATH OF AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF (1) AT LEAST ABOUT 2 PERCENT BY WEIGHT OF AT LEAST ONE SALT SELECTED FROM THE GROUP CONSISTING OF THE SODIUM AND POTASSIUM SALTS OF SULFURIC ACID AND NITRIC ACID; AND (2) NOT MORE THAN ABOUT 10 PERCENT BY WEIGHT OF AN ORGANIC SUBSTANCE CAPABLE OF FORMING COMPLEX IONS WITH IRON, CHROMIUM AND NICKEL, THE STEP OF RECOVERING IRON, NICKEL AND CHROMIUM DISSOLVED IN THE ELECTROLYTE DURING THE ELECTROLYSIS BY FIRST PRECIPITATING THE IRON IN THE FORM OF ITS HYDROXIDE AT A PH OF ABOUT 3 TO 5 AND REMOVING THE IRON HYDROXIDE FROM THE BATH, THEN PRECIPITATING THE CHROMIUM IN THE FORM OF ITS HYDROXIDE AT A PH OF ABOUT 5 TO 6 AND REMOVING THE CHROMIUM HYDROXIDE FROM THE BATH, AND THEREAFTER PRECIPITATING THE NICKEL IN THE FORM OF ITS HYDROXIDE AT A PH OF ABOUT 6 TO 8 AND REMOVING THE NICKEL HYDROXIDE FROM THE BATH.
Claim 2
Dependent Claim
177 words
IN A METOD OF ELECTROLYTICALLY DESCALING NICKEL AND CHROMIUM CONTAINING STEEL, WHEREIN THE ELECTROLYSIS IS CARRIED OUT IN AN ELECTROLYTIC BATH OF AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF (1) AT LEAST ABOUT 2 PERCENT BY WEIGHT OF AT LEAST ONE SALT SELECTED FROM THE GROUP CONSISTING OF THE SODIUM AND POTASSIUM SALTS OF SULFURIC ACID AND NITRIC ACID; AND (2) NOT MORE THAN ABOUT 10 PERCENT BY WEIGHT OF AN ORGANIC SUBSTANCE CAPABLE OF FORMING COMPLEX IONS WITH IRON, CHROMIUM AND NICKEL, THE STEP OF RECOVERING IRON, NICKEL AND CHROMIUM DISSOLVED IN THE ELECTROLYTE DURING THE ELECTROLYSIS BY FIRST PRECIPITATING THE IRON IN THE FORM OF ITS HYDROXIDE AT A PH OF ABOUT 3 TO 5 AND REMOVING THE IRON HYDROXIDE FROM THE BATH, THEN PRECIPITATING THE CHROMIUM IN THE FORM OF ITS HYDROXIDE AT A PH OF ABOUT 5 TO 6 AND REMOVING THE CHROMIUM HYDROXIDE FROM THE BATH, AND THEREAFTER PRECIPITATING THE NICKEL IN THE FORM OF ITS HYDROXIDE AT A PH OF ABOUT 6 TO 8 AND REMOVING THE NICKEL HYDROXIDE FROM THE BATH.
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) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |