Patent US2970716A successfully refreshed from Google Patents.
US3679554A
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US
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Method for electrolytic treatment of steel surface in a chromate solution
Assignee: JFE Engineering Corp
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Filing: 1970-01-02
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Granted: 1972-07-25
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Expires: 1990-01-02
Abstract
Abstract WITH RESPECT TO THE PRIOR ART METHOD WHICH COMPRISES IMMERSING A STEEL PLATE AS A CATHODE IN AN ELECTROLYTE IN WHICH THERE ARE DISSOLVED A MAIN AGENT OF CHROMIC ACID OR CHROMATES AND A PROMOTIVE AGENT OF INORGANIC SULFUR COMPOUNDS, AND SUBJECTING THE SURFACE OF SAID ARTICLE TO ELECTROLYTIC TREATMENT SO AS TO IMPROVE THE PAINT ADHESION AND CORROSION RESISTANCE OF SAID SURFACE, IT HAS BEEN FOUND THAT ADDITION OF FLUORINE COMPOUNDS TO SAID ELECTROLYTE AS A SECOND PROMOTER WILL ELEVATE THE PAINT ADHESION TO THE TREATED SURFACE.
Inventors
- 👤 Hidehisa Yamagishi
- 👤 Hiroshi Takano
- 👤 Masao Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:02
CPC Classifications
C; C25; C25D; C25D9/00; C25D9/04; C25D9/08; C25D9/10; 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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |