US2719796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for enameling aluminum
Assignee: Alcoa Corp
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Filing: 1954-03-24
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Granted: 1955-10-04
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Expires: 1974-03-24
Abstract
No abstract record available.
Inventors
- 👤 Walter R Kappes
- 👤 Berg Russel V Vanden
- 👤 Jr Richard A Wodehouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:42
CPC Classifications
C; C23; C23D; C23D3/00; C23G; C23G1/00; C23G1/02; C23G1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
THE PROCESS FOR PRODUCING AN ADHERENT ENAMEL COATING ON ALUMINUM WHICH COMPRISES TREATING THE ALUMINUM IN AN AQUEOUS ACID SOLUTION CONTAINING BETWEEN 2 AND 4 PER CENT BY WEIGHT OF CHROMIC ACID AND BETWEEN 10 AND 25 PER CENT SULFURIC ACID, AT A TEMPERATURE OF BETWEEN 70 TO 100* C., FOR A PERIOD BETWEEN 1 AND 5 MINUTES, AND THERAFTER ENAMELING THE ALUMINUM WITH AN ENAMEL HAVING A MELTING POINT BELOW ABOUT 580* C. BY APPLYING THE ENAMEL TO THE ALUMINUM AND FIRING THE SAME ABOVE THE FUSING POINT OF THE ENAMEL AT A TEMPERATURE BETWEEN 500 AND 580* C.
Claim 2
Dependent Claim
100 words
THE PROCESS FOR PRODUCING AN ADHERENT ENAMEL COATING ON ALUMINUM WHICH COMPRISES TREATING THE ALUMINUM IN AN AQUEOUS ACID SOLUTION CONTAINING BETWEEN 2 AND 4 PER CENT BY WEIGHT OF CHROMIC ACID AND BETWEEN 10 AND 25 PER CENT SULFURIC ACID, AT A TEMPERATURE OF BETWEEN 70 TO 100* C., FOR A PERIOD BETWEEN 1 AND 5 MINUTES, AND THERAFTER ENAMELING THE ALUMINUM WITH AN ENAMEL HAVING A MELTING POINT BELOW ABOUT 580* C. BY APPLYING THE ENAMEL TO THE ALUMINUM AND FIRING THE SAME ABOVE THE FUSING POINT OF THE ENAMEL AT A TEMPERATURE BETWEEN 500 AND 580* C.
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) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |