Patent US4462842A successfully refreshed from Google Patents.
US4462842A
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Surface treatment process for imparting hydrophilic properties to aluminum articles
Assignee: Altemira Co Ltd
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Filing: 1982-01-05
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Granted: 1984-07-31
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Expires: 2002-01-05
Abstract
Abstract An aluminum evaporator including a refrigerant tube and fins with a hydrophilic surface is prepared by forming a chemical coating over the surface of its components as assembled into a product or before fabrication, and thereafter forming a hydrophilic layer over the coating by treating the resulting components with a solution of silicic acid, silicate or colloidal silica.
Inventors
- 👤 Toshimitsu Uchiyama
- 👤 Eizo Isoyama
- 👤 Hiroichi Takenaka
- 👤 Masayuki Kaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:03
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C23C22/05; C23C22/06; C23C22/34; C23C22/60; C23C22/66
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A surface treatment process for imparting hydrophilic properties at least onto fin surfaces of an aluminum evaporator consisting of a first step of forming a chemical coating over the surface of the aluminum thereof by treating the aluminum with a solution of zirconium fluoride, and a second step of forming a hydrophilic layer over the coating by treating the resulting aluminum article with a solution of colloidal silica.
Claim 2
Dependent Claim
68 words
A surface treatment process for imparting hydrophilic properties at least onto fin surfaces of an aluminum evaporator consisting of a first step of forming a chemical coating over the surface of the aluminum thereof by treating the aluminum with a solution of zirconium fluoride, and a second step of forming a hydrophilic layer over the coating by treating the resulting aluminum article with a solution of colloidal silica.
Claim 3
Dependent Claim
63 words
A surface treatment process for imparting hydrophilic properties at least onto fin surfaces of an aluminum evaporator consisting of a first step of forming a chemical coating over the surface of the aluminum thereof by treating the aluminum with steam, and second step of forming a hydrophilic layer over the coating by treating the resulting aluminum article with a solution of colloidal silica.
Claim 4
Dependent Claim
63 words
A surface treatment process for imparting hydrophilic properties at least onto fin surfaces of an aluminum evaporator consisting of a first step of forming a chemical coating over the surface of the aluminum thereof by treating the aluminum with steam, and second step of forming a hydrophilic layer over the coating by treating the resulting aluminum article with a solution of colloidal silica.
Claim 5
Dependent Claim
104 words
A thin surface treatment process for imparting hydrophilic properties at least onto fin surfaces of an aluminum evaporator consisting of a first step of forming a chemical coating over the surface of the aluminum thereof by treating the aluminum with a solution of a member selected from the group consisting of chromic acid, chromates, dichromates, chromic acid-phosphoric acid, phosphoric acid, phosphates, titanates and tannic acid-titanic acid, and a second step of forming a hydrophilic layer over the coating by treating the resultant aluminum articles with a solution consisting of collodial silica, wherein the surface of the aluminum is roughened before forming the chemical coating.
Claim 6
Dependent Claim
104 words
A thin surface treatment process for imparting hydrophilic properties at least onto fin surfaces of an aluminum evaporator consisting of a first step of forming a chemical coating over the surface of the aluminum thereof by treating the aluminum with a solution of a member selected from the group consisting of chromic acid, chromates, dichromates, chromic acid-phosphoric acid, phosphoric acid, phosphates, titanates and tannic acid-titanic acid, and a second step of forming a hydrophilic layer over the coating by treating the resultant aluminum articles with a solution consisting of collodial silica, wherein the surface of the aluminum is roughened before forming the chemical coating.
Claim 7
Dependent Claim
71 words
A surface treatment process for imparting hydrophilic properties at least one fin surfaces of an aluminum evaporator consisting of a first step of forming a chemical coating over the surface of the aluminum thereof by treating the aluminum with deionized water at 40° C. to boiling temperature, and a second step of forming a hydrophilic layer over the coating by treating the resulting aluminum article with a solution of colloidal silica.
Claim 8
Dependent Claim
71 words
A surface treatment process for imparting hydrophilic properties at least one fin surfaces of an aluminum evaporator consisting of a first step of forming a chemical coating over the surface of the aluminum thereof by treating the aluminum with deionized water at 40° C. to boiling temperature, and a second step of forming a hydrophilic layer over the coating by treating the resulting aluminum article with a solution of colloidal silica.
Claim 9
Dependent Claim
14 words
A process as defined in claim 4 wherein the deionized water contains an amine.
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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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |