Patent US2825697A successfully refreshed from Google Patents.
US2825697A
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Method of and solution for the surface treatment of aluminum
Assignee: Henkel Corp
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Filing: 1954-08-05
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Granted: 1958-03-04
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Expires: 1974-08-05
Abstract
No abstract record available.
Inventors
- 👤 John A Carroll
- 👤 Jr Nelson J Newhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:12
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE METHOD OF INCREASING THE CORROSION RESISTANCE OF AN ALUMINUM SURFACE WITHOUT CHANGING ITS APPEARANCE WHICH CONSISTS IN TREATING THE SURFACE WITH AN AQUEOUS ACID SOLUTION CONSISTING ESSENTIALLY OF HEXAVALENT CHROMIUM AND A SOLUBLE COMPLEX FLUORINE-BEARING COMPOUND, THE AMOUNT OF HEXAVALENT CHROMIUM BEING FROM 0.4 GRAM TO 4 GRAMS PER LITER CALCULATED AS CRO3 AND THE AMOUNT OF FLUORINE-BEARING COMPOUND BEING FROM 0.1 GRAM TO 1.0 GRAM PER LITER CALCULATED AS FLUORINE AND THE PH OF THE SOLUTION BEING FROM 2.0 TO 4.0.
Claim 2
Independent Claim
83 words
THE METHOD OF INCREASING THE CORROSION RESISTANCE OF AN ALUMINUM SURFACE WITHOUT CHANGING ITS APPEARANCE WHICH CONSISTS IN TREATING THE SURFACE WITH AN AQUEOUS ACID SOLUTION CONSISTING ESSENTIALLY OF HEXAVALENT CHROMIUM AND A SOLUBLE COMPLEX FLUORINE-BEARING COMPOUND, THE AMOUNT OF HEXAVALENT CHROMIUM BEING FROM 0.4 GRAM TO 4 GRAMS PER LITER CALCULATED AS CRO3 AND THE AMOUNT OF FLUORINE-BEARING COMPOUND BEING FROM 0.1 GRAM TO 1.0 GRAM PER LITER CALCULATED AS FLUORINE AND THE PH OF THE SOLUTION BEING FROM 2.0 TO 4.0.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |