US3874902A
Expired / Lapsed
US
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Method of neutralizing surface color caused by anodizing aluminum alloys
Assignee: Stauffer Chemical Co
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Filing: 1974-05-28
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Granted: 1975-04-01
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Expires: 1994-05-28
Abstract
Abstract A surface color modification caused by anodizing certain aluminum alloys is neutralized by sealing the anodized surface in an aqueous solution containing a specific dye. The dye neutralizes said color modification without leaving a color of its own.
Inventors
- 👤 Joseph Moore Andrus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:05
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/24; C25D11/246; B; B05; B05D; B05D5/00; B05D5/06; B05D5/067; C25D11/243; B05D2202/00; B05D2202/20; B05D2202/25; B05D3/00; B05D3/10; B05D3/102
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
A METHOD OF NEUTRALIZING AN UNDESIRED CAST APPEARING IN AN ANODIZED SURFACE OF AN ALUMINUM ALLOY, BY SEALING SAID ANODIZED SURFACE WITH AN AQUEOUS SOLUTION CONTAINING A MONOAZO METALLIC DYE OF A COLOR AND IN A CONCENTRATION SUFFICIENT TO NEUTRALIZE SAID UNDESIRED CAST WITHOUT IMPARTING THE DYE COLOR TO SAID ANODIZED SURFACE WHEREIN SAID SOLUTION IS MAINTAINED AT A PH NECESSARY FOR OPTIMUM SELAING AND DYE ABSORPTION AND AT A TEMPERATURE BETWEEN ABOUT 180* AND 210*$0.5*F.
Claim 2
Independent Claim
76 words
A METHOD OF NEUTRALIZING AN UNDESIRED CAST APPEARING IN AN ANODIZED SURFACE OF AN ALUMINUM ALLOY, BY SEALING SAID ANODIZED SURFACE WITH AN AQUEOUS SOLUTION CONTAINING A MONOAZO METALLIC DYE OF A COLOR AND IN A CONCENTRATION SUFFICIENT TO NEUTRALIZE SAID UNDESIRED CAST WITHOUT IMPARTING THE DYE COLOR TO SAID ANODIZED SURFACE WHEREIN SAID SOLUTION IS MAINTAINED AT A PH NECESSARY FOR OPTIMUM SELAING AND DYE ABSORPTION AND AT A TEMPERATURE BETWEEN ABOUT 180* AND 210*$0.5*F.
Claim 3
Dependent Claim
16 words
A method as in claim 1 wherein said aluminum alloy is chemically brightened prior to anodizing.
Claim 4
Independent Claim
88 words
A method of neutralizing an undesired cast appearing in an anodized surface of an aluminum alloy, by sealing said anodized surface for about 10 to 30 minutes with an aqueous solution containing a monoazo metallic dye of a color and in a concentration sufficient to neutralize said undesired cast without imparting the dye color to said anodized surface wherein said solution is maintained at a pH between about 5.5 and 6.5 + or - 0.1 and at a temperature between about 180* and 210* + or - 5*F.
Claim 5
Independent Claim
88 words
A method of neutralizing an undesired cast appearing in an anodized surface of an aluminum alloy, by sealing said anodized surface for about 10 to 30 minutes with an aqueous solution containing a monoazo metallic dye of a color and in a concentration sufficient to neutralize said undesired cast without imparting the dye color to said anodized surface wherein said solution is maintained at a pH between about 5.5 and 6.5 + or - 0.1 and at a temperature between about 180* and 210* + or - 5*F.
Claim 6
Dependent Claim
16 words
A method as in claim 3 wherein said aluminum alloy is chemically brightened prior to anodization.
Claim 7
Independent Claim
70 words
A method of neutralizing a yellow cast appearing in an anodized surface of a copper-containing aluminum alloy, by sealing said anodized surface for about 15 minutes in an aqueous solution containing about 15 milligrams per liter of a monoazo metallic dye to neutralize said yellow cast, wherein said solution is maintained at a pH between about 5.6 and 5.7 and at a temperature of about 205* + or - 5*F
Claim 8
Independent Claim
70 words
A method of neutralizing a yellow cast appearing in an anodized surface of a copper-containing aluminum alloy, by sealing said anodized surface for about 15 minutes in an aqueous solution containing about 15 milligrams per liter of a monoazo metallic dye to neutralize said yellow cast, wherein said solution is maintained at a pH between about 5.6 and 5.7 and at a temperature of about 205* + or - 5*F
Claim 9
Dependent Claim
16 words
A method as in claim 5 wherein said aluminum alloy is chemically brightened prior to anodizing.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |