US2867514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of deoxidizing an aluminum surface
Assignee: Henkel Corp
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Filing: 1955-09-12
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Granted: 1959-01-06
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Expires: 1975-09-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Nelson J Newhard
- 👤 James H Thirsk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:49
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37; C23C22/73; C23C22/77; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
THE METHOD OF TREATING AN ALUMINUM SURFACE WHICH CONSISTS IN SUBJECTING THE SURFACE TO THE ACTION OF AN AQUEOUS ACID SOLUTION CONSISTING ESSENTIALLY OF HEXAVALENT CHROMIUM AND FLORIDE, THE QUANTITY OF HEXVALENT CHROMIUM BEING FROM 10 TO 100 GRAMS PER LITER AND THE QUANTITY OF FLUORIDE BEING SUFFICIENT TO GIVE A BATH ACTIVITY AT LEAST AS GREAT AS A SOLUTION OF: CHROMIC ACID GRAMS 30 48.8% HYDROFLUORIC ACID MILLILTERS 0.25 WATER, TO MAKE 1 LITER BUT HAVING NO MORE ACTIVITY THAN A SOLUTION OF: CHROMIC ACID GRAMS 30 48.8% HYDROFLUORIC ACID MILLILTERS 1 WATER, TO MAKE 1 LITER. THE PH OF THE SOLUTION BEING BETWEEN 0.5 AND 1.0. AND THE TREATMENT BEING CONTINUED UNTIL THE SURFACE IS DEOXIDIZED.
Claim 2
Independent Claim
118 words
THE METHOD OF TREATING AN ALUMINUM SURFACE WHICH CONSISTS IN SUBJECTING THE SURFACE TO THE ACTION OF AN AQUEOUS ACID SOLUTION CONSISTING ESSENTIALLY OF HEXAVALENT CHROMIUM AND FLORIDE, THE QUANTITY OF HEXVALENT CHROMIUM BEING FROM 10 TO 100 GRAMS PER LITER AND THE QUANTITY OF FLUORIDE BEING SUFFICIENT TO GIVE A BATH ACTIVITY AT LEAST AS GREAT AS A SOLUTION OF: CHROMIC ACID GRAMS 30 48.8% HYDROFLUORIC ACID MILLILTERS 0.25 WATER, TO MAKE 1 LITER BUT HAVING NO MORE ACTIVITY THAN A SOLUTION OF: CHROMIC ACID GRAMS 30 48.8% HYDROFLUORIC ACID MILLILTERS 1 WATER, TO MAKE 1 LITER. THE PH OF THE SOLUTION BEING BETWEEN 0.5 AND 1.0. AND THE TREATMENT BEING CONTINUED UNTIL THE SURFACE IS DEOXIDIZED.
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) | 1962-01-05 | 1962-07-07 | 1963-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-05 | 1966-07-07 | 1967-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-05 | 1970-07-07 | 1971-01-06 | $7700.00 | Window Closed / Lapsed |