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US3864221A
Expired / Lapsed
US
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Coating of a steel or iron with a chromium containing surface layer
Assignee: Rederi Nordstjernan AB
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Filing: 1973-06-22
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Granted: 1975-02-04
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Expires: 1993-06-22
Abstract
Abstract A ductile chromium coating is produced on a carbon-containing steel or iron substrate by first coating the substrate with at least one metal from the group consisting of Cu, Ag, Au, Pd, Pt, Rh, Ir, Ru, Os and CuNi alloy and then depositing a metal layer consisting essentially of chromium by electrolysis from a salt bath at a temperature in excess of 700*C.
Inventors
- 👤 Lars Henry Ramqvist
- 👤 Henrik Werme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:22
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/66; C25D5/00; C25D5/10; C25D5/12; Y; Y10; Y10S; Y10S205/00; Y10S205/917; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
17 words
The process of claim 1, wherein the temperature of said salt bath is at least about 1000*C.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |