US2563430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method op 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
2026-10-29 08:42
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN THE ART OF COATING ALUMINUM TO INCREASE ITS RESISTANCE TO CORROSION AND ABRASION WHERE THE SURFACE OF THE METAL IS COATED BY 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 ORSENIC ACIDS; THE METHOD WHICH CONSISTS IN TREATING A SURFACE SO COATED WITH AN AQUEOUS SOLUTION OF A NON-ALKALI METALLIC CHROMATE IN CHROMIC ACID, SAID NONALKALI METALLIC CHROMATE HAVING A SOLUBILITY IN THE CHROMIC ACID SUFFICIENT TO YIELD A CONCENTRATION OF AT LEAST 5 BUT NOT MORE THAN 250 GRAMS PER LITER CALCULATED AS ZNCRO4, THE TREATING SOLUTION BEING CHARACTERIZED BY HAVING A PH OF FROM 3.5 TO 6.0 AND A FREE TO TOTAL ACID RATIO OF 1:1.5 TO 1:2.5.
Claim 2
Dependent Claim
132 words
IN THE ART OF COATING ALUMINUM TO INCREASE ITS RESISTANCE TO CORROSION AND ABRASION WHERE THE SURFACE OF THE METAL IS COATED BY 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 ORSENIC ACIDS; THE METHOD WHICH CONSISTS IN TREATING A SURFACE SO COATED WITH AN AQUEOUS SOLUTION OF A NON-ALKALI METALLIC CHROMATE IN CHROMIC ACID, SAID NONALKALI METALLIC CHROMATE HAVING A SOLUBILITY IN THE CHROMIC ACID SUFFICIENT TO YIELD A CONCENTRATION OF AT LEAST 5 BUT NOT MORE THAN 250 GRAMS PER LITER CALCULATED AS ZNCRO4, THE TREATING SOLUTION BEING CHARACTERIZED BY HAVING A PH OF FROM 3.5 TO 6.0 AND A FREE TO TOTAL ACID RATIO OF 1:1.5 TO 1:2.5.
References Cited (Backward Citations)
US1946151A
Cited
US2213263A
Cited
US2245609A
Cited
US2314887A
Cited
US2312855A
Cited
US2318656A
Cited
US2472864A
Cited
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 |