US2858245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for enameling aluminum
Assignee: Henkel Corp
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Filing: 1956-08-16
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Granted: 1958-10-28
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Expires: 1976-08-16
Abstract
No abstract record available.
Inventors
- 👤 John A Carroll
- 👤 James H Thirsk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:00
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37; C23C22/38; C23D; C23D3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF APPYING VITREOUS ENAMEL COATINGS TO ALUMINUM AND ALUMINUM ALLOYS WHICH COMPRISES SUBJECTING THE METAL SURFACE TO BE ENAMELED TO A SEQUENTIAL SERIES OF OPERATIONS TO CLEAN AND PRETREAT SAID SURFACE BEFORE APPLYING AND FIRING THE ENAMEL COATING, SAID SEQUENTIAL OPERATIONS COMPRISING FIRST SUBJECTING SAID SURFACE TO THE ACTION OF AN AQUEOUS ALKALI SOLUTION, THEREAFTER SUBJECTING SAID SURFACE TO THE ACTION OF A DEOXIDIZING SOLUTION CAPABLE OF DISSOLVING METALLIC OXIDES, AND THEN FORMING A CHROMATE CONVERSION COATING ON SAID SURFACE BY SUBJECTING IT TO THE ACTION OF AN AQUEOUS ACIDIC SOLUTION CONTAINING HEXAVALENT CHROMIUM IONS AND FLUORIDE IONS, RINSING THE SURFACE TO REMOVE THE TREATING SOLUTION, AND THEREAFTER APPLYING THE ENAMEL TO THE THUS TREATED SURFACE AND FORMING THE VITREOUS ENAMEL COATING BY FUSING THE ENAMEL.
Claim 2
Independent Claim
128 words
THE METHOD OF APPYING VITREOUS ENAMEL COATINGS TO ALUMINUM AND ALUMINUM ALLOYS WHICH COMPRISES SUBJECTING THE METAL SURFACE TO BE ENAMELED TO A SEQUENTIAL SERIES OF OPERATIONS TO CLEAN AND PRETREAT SAID SURFACE BEFORE APPLYING AND FIRING THE ENAMEL COATING, SAID SEQUENTIAL OPERATIONS COMPRISING FIRST SUBJECTING SAID SURFACE TO THE ACTION OF AN AQUEOUS ALKALI SOLUTION, THEREAFTER SUBJECTING SAID SURFACE TO THE ACTION OF A DEOXIDIZING SOLUTION CAPABLE OF DISSOLVING METALLIC OXIDES, AND THEN FORMING A CHROMATE CONVERSION COATING ON SAID SURFACE BY SUBJECTING IT TO THE ACTION OF AN AQUEOUS ACIDIC SOLUTION CONTAINING HEXAVALENT CHROMIUM IONS AND FLUORIDE IONS, RINSING THE SURFACE TO REMOVE THE TREATING SOLUTION, AND THEREAFTER APPLYING THE ENAMEL TO THE THUS TREATED SURFACE AND FORMING THE VITREOUS ENAMEL COATING BY FUSING THE ENAMEL.
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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |