US2593448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for treating aluminum and aluminum alloys
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1949-07-25
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Granted: 1952-04-22
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Expires: 1969-07-25
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Hesch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
A COMPOSITION FOR THE CHEMICAL BRIGHTENING OF ALUMINUM AND ALUMINUM ALLOYS COMPRISING AN AQUEOUS ACID SOLUTION CONTAINING HYDROGEN, NITRITE, FLUORIDE, AND CHROMATE IONS AND THE CATIONS OF A METAL MORE ELECTROPOSITIVE THAN ALUMINUM IN CONCENTRATION CORRESPONDING TO THAT PRODUCED BY A SOLUTION CONTAINING BY WEIGHT FROM ABOUT .5 TO ABOUT 6% NITRIC ACID, ABOUT .01 TO ABOUT 0.5% HYDROFLUORIC ACID, ABOUT 0.1 TO ABOUT 1.5% CHROMIC ACID ANHYDRIDE, AND FROM ABOUT .01 TO ABOUT 0.6% OF A SOLUBLE SALT OF TH SELECTED METAL.
Claim 2
Dependent Claim
83 words
A COMPOSITION FOR THE CHEMICAL BRIGHTENING OF ALUMINUM AND ALUMINUM ALLOYS COMPRISING AN AQUEOUS ACID SOLUTION CONTAINING HYDROGEN, NITRITE, FLUORIDE, AND CHROMATE IONS AND THE CATIONS OF A METAL MORE ELECTROPOSITIVE THAN ALUMINUM IN CONCENTRATION CORRESPONDING TO THAT PRODUCED BY A SOLUTION CONTAINING BY WEIGHT FROM ABOUT .5 TO ABOUT 6% NITRIC ACID, ABOUT .01 TO ABOUT 0.5% HYDROFLUORIC ACID, ABOUT 0.1 TO ABOUT 1.5% CHROMIC ACID ANHYDRIDE, AND FROM ABOUT .01 TO ABOUT 0.6% OF A SOLUBLE SALT OF TH SELECTED METAL.
Claim 3
Dependent Claim
110 words
A PROCESS FOR THE CHEMICAL BRIGHTENING OF ALUMINUM AND ALUMINUM ALLOYS WHICH COMPRISES IMMERSING THE METAL IN A HEATED AQUEOUS BATH CONTAINING BY WEIGHT ABOUT .5 TO ABOUT 6% NITRIC ACID, ABOUT 0.01 TO ABOUT 0.5% HYDROFLUORIC ACID, ABOUT 0.1 TO ABOUT 0.6% OF A WATER SOLUBLE SALT OF A METAL ELECTROPOSITIVE TO HYDROGEN, AND ABOUT 0.1 TO ABOUT 1.5% CHROMIC ACID (CALCULATED AS CRO3) FOR FROM ABOUT ONE-HALF TO ABOUT TEN MINUTES, MAINTAINING THE TEMPERATURE OF THE BATH AT ABOUT 190*F. TO THE BOILING POINT, AND THEREAFTER WATER RINSING THE THUS TREATED METAL, THE PRESENCE OF CHROMATE ION PREVENTING DEPOSITION OF METALLIC SMUT ON THE ALUMINUM AND ALUMINUM ALLOYS.
Claim 4
Dependent Claim
110 words
A PROCESS FOR THE CHEMICAL BRIGHTENING OF ALUMINUM AND ALUMINUM ALLOYS WHICH COMPRISES IMMERSING THE METAL IN A HEATED AQUEOUS BATH CONTAINING BY WEIGHT ABOUT .5 TO ABOUT 6% NITRIC ACID, ABOUT 0.01 TO ABOUT 0.5% HYDROFLUORIC ACID, ABOUT 0.1 TO ABOUT 0.6% OF A WATER SOLUBLE SALT OF A METAL ELECTROPOSITIVE TO HYDROGEN, AND ABOUT 0.1 TO ABOUT 1.5% CHROMIC ACID (CALCULATED AS CRO3) FOR FROM ABOUT ONE-HALF TO ABOUT TEN MINUTES, MAINTAINING THE TEMPERATURE OF THE BATH AT ABOUT 190*F. TO THE BOILING POINT, AND THEREAFTER WATER RINSING THE THUS TREATED METAL, THE PRESENCE OF CHROMATE ION PREVENTING DEPOSITION OF METALLIC SMUT ON THE ALUMINUM AND ALUMINUM ALLOYS.
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) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |