US3717510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the blackening of aluminium
Assignee: Reactor Centrum Nederland
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Filing: 1971-03-10
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Granted: 1973-02-20
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Expires: 1991-03-10
Abstract
Abstract AN EVEN, TENACIOUS BLACK COATING OF NICKEL SULFIDE IS APPLIED TO THE SURFACE OF ALUMINUM ALLOYS BY IMMERSION OF THE ALLOY INTO AN AQUEOUS BATH CONTAINING FROM 35200 G./L. OF NICL2.6 AQ AND FROM 0.03-0.25 MOLAR OF THIOCYANATE IONS FOR A PERIOD UP TO 5 MINUTES ACCORDING TO THE PROCESS DISCLOSED. PREFERABLY THE AQUEOUS BATH ALSO CONTAINS FROM 10-20 G./L. OF NH4CL, FROM 8-12 G./L. OF KCNS AND IS MAINTAINED AT A PH IN THE RANGE OF 3-4.
Inventors
- 👤 C Boose
- 👤 M Reidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:15
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/48; C23C22/56
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |