Patent US4158074A successfully refreshed from Google Patents.
US4158074A
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Process for preparing colored aluminum powder
Assignee: Altemira Co Ltd
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Filing: 1978-02-21
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Granted: 1979-06-12
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Expires: 1998-02-21
Abstract
Abstract Colored aluminum powder is prepared by immersing finely divided aluminum in a weak alkali solution maintained at a temperature of 50 DEG C. to the boiling point of the solution and having a pH of 8 to 12, said solution containing a salt of iron, nickel, cobalt, zinc or copper, and at least one aliphatic amine having a chelating ability for the metal salt, to form a composite film which consists of a hydrated aluminum oxide and a hydrated oxide of the metal, and separating the aluminum from the solution.
Inventors
- 👤 Toshimitsu Uchiyama
- 👤 Minoru Hasegawa
- 👤 Tatsuo Ootsuka
- 👤 Hiroshi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:46
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/62; C09C1/64; C09C1/642; B; B22; B22F; B22F1/00; B22F1/16; C09C1/644; C09C1/648; C09C3/00; C09C3/006; C09C3/06; C09C3/063; C09C3/08; C01; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A process for preparing a colored aluminum powder consisting essentially of the steps of immersing finely divided aluminum in a weak alkali solution maintained at a temperature of between 50° C. and the boiling point of the solution and having a pH of 8 to 12, said solution containing a salt of a metal selected from the group consisting of iron, nickel, cobalt, zinc and copper, and at least one amine selected from the group consisting of methylamine, dimethylamine, ethylamine, ethylenediamine, monoethanolamine, diethanolamine and triethanolamine, to form a composite film which consists of a hydrated aluminum oxide and a hydrated oxide of the metal, and separating the resulting aluminum particles from the solution to obtain colored aluminum particles.
Claim 2
Dependent Claim
118 words
A process for preparing a colored aluminum powder consisting essentially of the steps of immersing finely divided aluminum in a weak alkali solution maintained at a temperature of between 50° C. and the boiling point of the solution and having a pH of 8 to 12, said solution containing a salt of a metal selected from the group consisting of iron, nickel, cobalt, zinc and copper, and at least one amine selected from the group consisting of methylamine, dimethylamine, ethylamine, ethylenediamine, monoethanolamine, diethanolamine and triethanolamine, to form a composite film which consists of a hydrated aluminum oxide and a hydrated oxide of the metal, and separating the resulting aluminum particles from the solution to obtain colored aluminum particles.
Claim 3
Dependent Claim
29 words
The process as defined in claim 1 wherein the weak alkali solution further contains an alkali selected from the group consisting of alkali hydroxides, alkali carbonates and alkali aluminates.
Claim 4
Dependent Claim
32 words
The process as defined in claim 1 wherein the weak alkali solution further contains at least one member selected from the group consisting of water soluble aliphatic carboxylic acids and their salts.
Claim 5
Dependent Claim
104 words
A process for preparing a colored aluminum powder consisting essentially of the steps of immersing finely divided aluminum in a weak alkali solution maintained at a temperature of between 50° C. and the boiling point of the solution and having a pH of 8 to 12, said solution containing 0.001 to 0.5 mol/liter of an iron salt, 0.01 to 2.0 mol/liter of triethanolamine and 0.001 to 2.0 mol/liter of oxalic acid, to form a composite film which consists of a hydrated aluminum oxide and a hydrated iron oxide, and separating the resulting aluminum particles from the solution to obtain aluminum particles colored in gold.
Claim 6
Dependent Claim
104 words
A process for preparing a colored aluminum powder consisting essentially of the steps of immersing finely divided aluminum in a weak alkali solution maintained at a temperature of between 50° C. and the boiling point of the solution and having a pH of 8 to 12, said solution containing 0.001 to 0.5 mol/liter of an iron salt, 0.01 to 2.0 mol/liter of triethanolamine and 0.001 to 2.0 mol/liter of oxalic acid, to form a composite film which consists of a hydrated aluminum oxide and a hydrated iron oxide, and separating the resulting aluminum particles from the solution to obtain aluminum particles colored in gold.
Claim 7
Dependent Claim
167 words
A process for preparing a colored aluminum powder consisting essentially of the steps of forming a hydrated aluminum oxide film on the surface of aluminum particles by immersing the aluminum particles in a solution maintained at a temperature of 50° C. to the boiling point of the solution and having a pH of 7 to 12, immersing the aluminum particles with the thus formed hydrated oxide film in a weak alkali solution maintained at a temperature of between 50° C. and the boiling point of the solution and having a pH of 8 to 12, said solution containing a salt of a metal selected from the group consisting of iron, nickel, cobalt, zinc and copper, and at least one amine selected from the group consisting of methylamine, dimethylamine, ethylamine, ethylenediamine, monoethanolamine, diethanolamine, and triethanolamine, to form a composite film which consists of a hydrated aluminum oxide and a hydrated oxide of the metal, and separating the resulting aluminum particles from the solution to obtain colored aluminum particles.
Claim 8
Dependent Claim
167 words
A process for preparing a colored aluminum powder consisting essentially of the steps of forming a hydrated aluminum oxide film on the surface of aluminum particles by immersing the aluminum particles in a solution maintained at a temperature of 50° C. to the boiling point of the solution and having a pH of 7 to 12, immersing the aluminum particles with the thus formed hydrated oxide film in a weak alkali solution maintained at a temperature of between 50° C. and the boiling point of the solution and having a pH of 8 to 12, said solution containing a salt of a metal selected from the group consisting of iron, nickel, cobalt, zinc and copper, and at least one amine selected from the group consisting of methylamine, dimethylamine, ethylamine, ethylenediamine, monoethanolamine, diethanolamine, and triethanolamine, to form a composite film which consists of a hydrated aluminum oxide and a hydrated oxide of the metal, and separating the resulting aluminum particles from the solution to obtain colored aluminum particles.
Claim 9
Dependent Claim
155 words
A process for preparing a colored aluminum powder consisting essentially of the steps of forming a hydrated aluminum oxide film on the surface of aluminum particles by immersing the aluminum particles in a solution maintained at a temperature of between 50° C. to the boiling point of the solution and having a pH of 7 to 12, immersing the aluminum particles with the thus formed hydrated oxide film in a weak alkali solution maintained at a temperature of between 50° C. and the boiling point of the solution and having a pH of 8 to 12, said solution containing 0.001 to 0.5 mol/liter of an iron salt, 0.01 to 2.0 mol/liter of triethanolamine, and 0.001 to 2.0 mol/liter of oxalic acid, to form a composite film which consists of a hydrated aluminum oxide and a hydrated iron oxide, and separating the the resulting aluminum particles from the solution to obtain aluminum particles colored in gold.
Claim 10
Dependent Claim
155 words
A process for preparing a colored aluminum powder consisting essentially of the steps of forming a hydrated aluminum oxide film on the surface of aluminum particles by immersing the aluminum particles in a solution maintained at a temperature of between 50° C. to the boiling point of the solution and having a pH of 7 to 12, immersing the aluminum particles with the thus formed hydrated oxide film in a weak alkali solution maintained at a temperature of between 50° C. and the boiling point of the solution and having a pH of 8 to 12, said solution containing 0.001 to 0.5 mol/liter of an iron salt, 0.01 to 2.0 mol/liter of triethanolamine, and 0.001 to 2.0 mol/liter of oxalic acid, to form a composite film which consists of a hydrated aluminum oxide and a hydrated iron oxide, and separating the the resulting aluminum particles from the solution to obtain aluminum particles colored in gold.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |