US4588025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum heat exchanger provided with fins having hydrophilic coating
Assignee: Resonac Holdings Corp
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Filing: 1984-11-07
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Granted: 1986-05-13
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Expires: 2004-11-07
Abstract
Abstract The fins of an aluminum heat exchanger are treated with a coating composition comprising an alkali silicate and a low-molecular-weight compound having carbonyl and are thereafter heated for drying, whereby a hydrophilic coating is formed over the surfaces of the fins.
Inventors
- 👤 Takaichi Imai
- 👤 Takeshi Yamada
- 👤 Kunio Sakaue
- 👤 Eizo Isoyama
- 👤 Masaaki Mizoguchi
- 👤 Katsumi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:11
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F2245/00; F28F2245/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
68 words
A heat exchanger made of aluminum and comprising a tube and fins attached to the tube, the heat exchanger being characterized in that the fins are treated with a coating composition comprising an alkali silicate A a low-molecular-weight organic compound B having carbonyl and a water-soluble high-molecular-weight organic compound C and are thereafter dried by heating, whereby a hydrophilic coating is formed over the surfaces of the fins.
Claim 2
Dependent Claim
68 words
A heat exchanger made of aluminum and comprising a tube and fins attached to the tube, the heat exchanger being characterized in that the fins are treated with a coating composition comprising an alkali silicate A a low-molecular-weight organic compound B having carbonyl and a water-soluble high-molecular-weight organic compound C and are thereafter dried by heating, whereby a hydrophilic coating is formed over the surfaces of the fins.
Claim 3
Dependent Claim
92 words
A heat exchanger as defined in claim 1 wherein the alkali silicate A contained in the coating composition is at least 1 in the ratio of SiO 2 /M 2 O wherein M is lithium, sodium, potassium or like alkali metal, and the carbonyl-containing low-molecular-weight compound B is at least one compound selected from the group consisting of aldehydes, esters and amides, the water-soluble high-molecular-weight organic compound C being one compound selected from the group consisting of polyacrylic acid, acrylic acid copolymer, maleic acid copolymer and alkali metal salts of these compounds.
Claim 4
Dependent Claim
47 words
A heat exchanger as defined in claim 1 wherein the coating composition comprises 0.1 to 5 parts by weight of the low-molecular-weight compound B and 0.01 to 5 parts by weight of the water-soluble high-molecular-weight organic compound C per part by weight of the alkali silicate A.
Claim 5
Dependent Claim
92 words
A heat exchanger as defined in claim 3 wherein the alkali silicate A contained in the coating composition is at least 1 in the ratio of SiO 2 /M 2 O wherein M is lithium, sodium, potassium of like alkali metal, and the carbonyl-containing low-molecular-weight compound B is at least one compound selected from the group consisting of aldehydes, esters and amides, the water-soluble high-molecular-weight organic compound C being one compound selected from the gourp consisting of polyacrylic acid, acrylic acid copolymer, maleic acid copolymer and alkali metal salts of these compounds.
References Cited (Backward Citations)
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Cited
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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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |