US2563431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the resistance
Assignee: —
•
Filing: —
•
Granted: 1951-08-07
•
Expires: 1968-08-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:28
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN THE ART OF COATING ALUMINUM TO INCREASE ITS RESISTANCE TO CORROSION AND ABRASION WHERE THE SURFACE OF THE METAL IS COATED BY SUBJECTING IT TO THE ACTION OF AN ACID AQUEOUS SOLUTION THE ESSENTIAL COATING-PRODUCING INGREDIENTS OF WHICH ARE FLUORIDE IONS, DICHROMATE IONS AND IONS FROM THE CLASS OF ACIDS CONSISTING OF PHOSPHORIC AND ARSENIC ACIDS; THE METHOD WHICH CONSISTS IN TREATING A SURFACE SO COATED WITH AN AQUEOUS SOLUTION HAVING A PH OF FROM 5.0 TO 6.5 AND CONTAINING AS ITS ESSENTIAL ACTIVE INGREDIENT A WATER SOLUBLE DICHROMATE TAKEN FROM THE CLASS WHICH CONSISTS OF THE ALKALI-METAL DICHROMATES AND AMMONIUM DICHROMATE IN A CONCENTRATION EXPRESSED AS CR2O7 OF FROM 3.5 TO 45 GRAMS PER LITER.
Claim 2
Dependent Claim
117 words
IN THE ART OF COATING ALUMINUM TO INCREASE ITS RESISTANCE TO CORROSION AND ABRASION WHERE THE SURFACE OF THE METAL IS COATED BY SUBJECTING IT TO THE ACTION OF AN ACID AQUEOUS SOLUTION THE ESSENTIAL COATING-PRODUCING INGREDIENTS OF WHICH ARE FLUORIDE IONS, DICHROMATE IONS AND IONS FROM THE CLASS OF ACIDS CONSISTING OF PHOSPHORIC AND ARSENIC ACIDS; THE METHOD WHICH CONSISTS IN TREATING A SURFACE SO COATED WITH AN AQUEOUS SOLUTION HAVING A PH OF FROM 5.0 TO 6.5 AND CONTAINING AS ITS ESSENTIAL ACTIVE INGREDIENT A WATER SOLUBLE DICHROMATE TAKEN FROM THE CLASS WHICH CONSISTS OF THE ALKALI-METAL DICHROMATES AND AMMONIUM DICHROMATE IN A CONCENTRATION EXPRESSED AS CR2O7 OF FROM 3.5 TO 45 GRAMS PER LITER.
References Cited (Backward Citations)
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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) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |