US3840441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pickling of steel plates prior to nickel plating and coating
Assignee: Bayer Rickmann GmbH
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Filing: 1972-07-14
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Granted: 1974-10-08
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Expires: 1992-07-14
Abstract
Abstract 1. IN THE PRETREATMENT OF STEEL PLATE FOR DIRECT-ON WHITE ENAMELING WHEREIN THE STEEL PLATE IS ELECTROLYTICALLY DEGREASED AND PICKED, AND NICKLE PLATED BY ELECTRODESPOSITION ON THE SURFACE TO BE ENAMELLED IN A QUANTITY OF ABOUT 0.3 TO 0.7 G. PER SQUARE METER OF STEEL PLATE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING STEEL HAVING A CARBON CONTENT OF ABOUT 0.043% AND EFFECTING THE ELECTROLYTIC PICKING TREATMENT AT A CURRENT DENSITY OF ABOUT 40 AMPERES/DM.2 IN AN ACID SOLUTION CONTAINING AT LEAST ONE OF THE SULFATE AND PHOSPHATE IONS FOR ABOUT 0.2 TO 3 MINUTES AT A TEMPERATURE OF ABOUT 40 TO 80* C.
Inventors
- 👤 B Hees
- 👤 H Hoffmann
- 👤 G Trogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:08
CPC Classifications
C; C23; C23D; C23D3/00; C25; C25D; C25D5/00; C25D5/34; C25D5/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN THE PRETREATMENT OF STEEL PLATE FOR DIRECT-ON WHITE ENAMELING WHEREIN THE STEEL PLATE IS ELECTROLYTICALLY DEGREASED AND PICKED, AND NICKLE PLATED BY ELECTRODESPOSITION ON THE SURFACE TO BE ENAMELLED IN A QUANTITY OF ABOUT 0.3 TO 0.7 G. PER SQUARE METER OF STEEL PLATE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING STEEL HAVING A CARBON CONTENT OF ABOUT 0.043% AND EFFECTING THE ELECTROLYTIC PICKING TREATMENT AT A CURRENT DENSITY OF ABOUT 40 AMPERES/DM.2 IN AN ACID SOLUTION CONTAINING AT LEAST ONE OF THE SULFATE AND PHOSPHATE IONS FOR ABOUT 0.2 TO 3 MINUTES AT A TEMPERATURE OF ABOUT 40 TO 80* C.
Claim 2
Dependent Claim
101 words
IN THE PRETREATMENT OF STEEL PLATE FOR DIRECT-ON WHITE ENAMELING WHEREIN THE STEEL PLATE IS ELECTROLYTICALLY DEGREASED AND PICKED, AND NICKLE PLATED BY ELECTRODESPOSITION ON THE SURFACE TO BE ENAMELLED IN A QUANTITY OF ABOUT 0.3 TO 0.7 G. PER SQUARE METER OF STEEL PLATE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING STEEL HAVING A CARBON CONTENT OF ABOUT 0.043% AND EFFECTING THE ELECTROLYTIC PICKING TREATMENT AT A CURRENT DENSITY OF ABOUT 40 AMPERES/DM.2 IN AN ACID SOLUTION CONTAINING AT LEAST ONE OF THE SULFATE AND PHOSPHATE IONS FOR ABOUT 0.2 TO 3 MINUTES AT A TEMPERATURE OF ABOUT 40 TO 80* C.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |