Patent US2493934A successfully refreshed from Google Patents.
US2493934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of protective coatings on aluminum and alloys thereof
Assignee: Reynolds Metals Co
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Filing: 1946-12-27
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Granted: 1950-01-10
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Expires: 1966-12-27
Abstract
No abstract record available.
Inventors
- 👤 Claude L Waring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:20
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/66; C23C22/67
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR TREATING ALLOYS PREDOMINANTLY ALUMINUM RENDERING SAID ARTICLES SUBSTANTIALLY RESISTANT TO CORROSION COMPRISING THE STEPS OF SUBJECTING THE ARTICLE TO AN AQUEOUS BATH CONSISTING OF SODIUM CARBONATE, 5 TO 10 PERCENT; SODIUM HYDROXIDE, 0.1 TO 0.4 PERCENT; POTASSIUM DICHROMATE, 0.2 TO 2.0 PERCENT: ALUMINUM CHLORIDE. 0.1 TO 0.3 PERCENT; SAID BATH BEING MAINTAINED AT A TEMPERATURE OF FROM 180 TO 212*F., FOR A PERIOD OF FROM 5 TO 20 MINUTES, WASHING THE SO-TREATED ARTICLE, SUBSEQUENTLY SUBJECTING THE ARTICLE TO A SECOND BATH, CONSISTING OF FROM .012 TO 0.1 PERCENT OF CHROMIC ACID IN AQUEOUS SOLUTION AT TEMPERATURES RANGING FROM 135 TO 145*F. FOR A PERIOD OF FROM 5 TO 10 MINUTES.
Claim 2
Dependent Claim
113 words
A PROCESS FOR TREATING ALLOYS PREDOMINANTLY ALUMINUM RENDERING SAID ARTICLES SUBSTANTIALLY RESISTANT TO CORROSION COMPRISING THE STEPS OF SUBJECTING THE ARTICLE TO AN AQUEOUS BATH CONSISTING OF SODIUM CARBONATE, 5 TO 10 PERCENT; SODIUM HYDROXIDE, 0.1 TO 0.4 PERCENT; POTASSIUM DICHROMATE, 0.2 TO 2.0 PERCENT: ALUMINUM CHLORIDE. 0.1 TO 0.3 PERCENT; SAID BATH BEING MAINTAINED AT A TEMPERATURE OF FROM 180 TO 212*F., FOR A PERIOD OF FROM 5 TO 20 MINUTES, WASHING THE SO-TREATED ARTICLE, SUBSEQUENTLY SUBJECTING THE ARTICLE TO A SECOND BATH, CONSISTING OF FROM .012 TO 0.1 PERCENT OF CHROMIC ACID IN AQUEOUS SOLUTION AT TEMPERATURES RANGING FROM 135 TO 145*F. FOR A PERIOD OF FROM 5 TO 10 MINUTES.
References Cited (Backward Citations)
GB226776A
Cited
US1946151A
Cited
US1946152A
Cited
US2106368A
Cited
US2146840A
Cited
US2337940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |