US2554256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating aluminum to provide selective coloration of portions thereof
Assignee: Westinghouse Electric Corp
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Filing: 1948-05-15
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Granted: 1951-05-22
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Expires: 1968-05-15
Abstract
No abstract record available.
Inventors
- 👤 Virginia E Lewis
- 👤 William E Collar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:53
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/40
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
86 words
THE PROCESS OF PREFERENTIALLY COLORING SELECTED PORTIONS OF ALUMINUM MEMBERS ALL OF WHOSE SURFACES HAVE BEEN EXPOSED TO AIR FOR MORE THAN 15 HOURS, THE STEPS COMPRISING ABRADING THE SELECTED PORTIONS TO REMOVE A SURFACR LAYER, AND APPLYING TO THE ABRADED PORTIONS, WITHIN 15 HOURS AFTER ABRADING AND WITHOUT EXPOSING THE ABRADED SURFACE TO TEMPERATURES OF ABOVE 300* C., A HOT AQUEOUS, NON-ALKALINE SOLUTION COMPOSED OF FROM 1 TO 120 GRAMS PER LITER OF AMMONIUM MOLYBDATE AND FROM 1 TO 128 GRAMS PER LITER OF AMMONIUM
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) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |