US2719781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and method for treating aluminum and aluminum alloys
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1952-04-09
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Granted: 1955-10-04
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Expires: 1972-04-09
Abstract
No abstract record available.
Inventors
- 👤 Hesch Frederick Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:49
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR CHEMICALLY BRIGHTENING ALUMINUM AND ALUMINUM ALLOYS WHICH COMPRISES IMMERSING THE METAL IN AN AQUEOUS ACID SOLUTION MAINTAINED AT FROM 180* F. TO BOILING AN CONSISTING ESSENTIALLY OF FLUORIDE IONS AND NITRIC ACID IN CONCENTRATIONS EQUIVALENT TO THE RELATIVE CONCENTRATIONS OF AMMONIUM FLUORIDE AND NITRIC ACID LYING WITHIN THE AREA DEFINED APPROXIMATELY IN THE ACCOMPANYING DIAGRAM BY THE SOLID LINES CH,HI,IF,GF AND GC, SAID SOLUTION CONTAINING ALSO COPPER IONS IN AMOUNT NOT SUBSTANTIALLY LESS THA 0.001 GRAM PER LITER FOR A TIME SUFFICIENT TO BRIGHTEN THE METAL, AND THEREAFTER RINSING AND DRYING THE METAL.
Claim 2
Dependent Claim
96 words
A PROCESS FOR CHEMICALLY BRIGHTENING ALUMINUM AND ALUMINUM ALLOYS WHICH COMPRISES IMMERSING THE METAL IN AN AQUEOUS ACID SOLUTION MAINTAINED AT FROM 180* F. TO BOILING AN CONSISTING ESSENTIALLY OF FLUORIDE IONS AND NITRIC ACID IN CONCENTRATIONS EQUIVALENT TO THE RELATIVE CONCENTRATIONS OF AMMONIUM FLUORIDE AND NITRIC ACID LYING WITHIN THE AREA DEFINED APPROXIMATELY IN THE ACCOMPANYING DIAGRAM BY THE SOLID LINES CH,HI,IF,GF AND GC, SAID SOLUTION CONTAINING ALSO COPPER IONS IN AMOUNT NOT SUBSTANTIALLY LESS THA 0.001 GRAM PER LITER FOR A TIME SUFFICIENT TO BRIGHTEN THE METAL, AND THEREAFTER RINSING AND DRYING THE METAL.
References Cited (Backward Citations)
US2593449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |