US2796370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and method for producing corrosion resistant protective coating on aluminum and aluminum alloys
Assignee: CHARLES W OSTRANDER
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Filing: 1955-03-04
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Granted: 1957-06-18
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Expires: 1975-03-04
Abstract
No abstract record available.
Inventors
- 👤 Charles W Ostrander
- 👤 Nicholas R Congiundi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:30
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
A COMPOSITION FOR USE IN THE ART OF APPLYING A CHEMICALLY BONDED COATING ON METAL SURFACES, SAID COMPOSITION CONSISTING ESSENTIALLY OF HEXAVALENT CHROMIUM, A FLUORINE-BEARING COMPOUND AND A SOLUBLE CYANIDE SELECTED FROM THE GROUP CONSISTING OF FERRICYANIDE AND FERROCYANIDE IN PROPORTIONS WHICH ARE CAPABLE OF COATING ALUMINUM.
Claim 2
Dependent Claim
47 words
A COMPOSITION FOR USE IN THE ART OF APPLYING A CHEMICALLY BONDED COATING ON METAL SURFACES, SAID COMPOSITION CONSISTING ESSENTIALLY OF HEXAVALENT CHROMIUM, A FLUORINE-BEARING COMPOUND AND A SOLUBLE CYANIDE SELECTED FROM THE GROUP CONSISTING OF FERRICYANIDE AND FERROCYANIDE IN PROPORTIONS WHICH ARE CAPABLE OF COATING ALUMINUM.
Claim 3
Independent Claim
67 words
A METHOD FOR IMPARTING A CORROSION-RESISTANT COATING TO ALUMINUM AND ALLOYS THEREOF WHICH COMPRISES SUBJECTING THE LATTER TO AN AQUEOUS ACIDIC SOLUTION COMPRISING WATER, AT LEAST ONE CHROMIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF CHROMIC ACID AND WATER SOLUBLE SALTS THEREOF AND AT LEAST ONE CYANIDE SELECTED FROM THE GROUP CONSISTING OF FERRICYANIC ACID, FERROCYANIC ACID, AND SALTS THEREOF AND MIXTURES OF THESE ACIDS AND SALTS.
Claim 4
Independent Claim
67 words
A METHOD FOR IMPARTING A CORROSION-RESISTANT COATING TO ALUMINUM AND ALLOYS THEREOF WHICH COMPRISES SUBJECTING THE LATTER TO AN AQUEOUS ACIDIC SOLUTION COMPRISING WATER, AT LEAST ONE CHROMIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF CHROMIC ACID AND WATER SOLUBLE SALTS THEREOF AND AT LEAST ONE CYANIDE SELECTED FROM THE GROUP CONSISTING OF FERRICYANIC ACID, FERROCYANIC ACID, AND SALTS THEREOF AND MIXTURES OF THESE ACIDS AND SALTS.
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) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |