US4664182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic fins for a heat exchanger
Assignee: Tokai Metals Co Ltd
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Filing: 1985-02-21
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Granted: 1987-05-12
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Expires: 2005-02-21
Abstract
Abstract A fin for a heat exchanger which is highly hydrophilic and rustproof comprises a substrate of aluminum or an aluminum alloy having thereon a hydrophilic coat including therein a proteinaceous substance having a peptide bond, e.g., gelatin. Further enhancement of the fin's affinity for water is obtained by using a hydrophilic coat prepared by mixing a water soluble coating material, such as acrylic paint, with the proteinaceous substance. The coat is made by applying a water-based coating composition including the proteinaceous substance to a substrate and drying it in the temperature range of 100° to 250° C., and preferably 180° to 220° C.
Inventors
- 👤 Kazuharu Miwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:55
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/02; F28F13/00; F28F13/18; F28F2245/00; F28F2245/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
31 words
A heat exchanger fin comprising: a metallic substrate; a hydrophilic coating on a surface of the substrate comprising a proteinaceous substance having a peptide bond and a water soluble coating material.
Claim 2
Dependent Claim
31 words
A heat exchanger fin comprising: a metallic substrate; a hydrophilic coating on a surface of the substrate comprising a proteinaceous substance having a peptide bond and a water soluble coating material.
Claim 3
Dependent Claim
23 words
A fin according to claim 1, wherein said metallic substrate comprises a metal selected from the group consisting of aluminum and aluminum alloys.
Claim 4
Dependent Claim
26 words
A fin according to claim 2, wherein said proteinaceous substance is selected from the group consisting of gelatin, casein and proteinaceous substances containing L-proline or L-oxyproline.
Claim 5
Dependent Claim
12 words
A fin according to claim 2, wherein said proteinaceous substance is gelatin.
Claim 6
Dependent Claim
28 words
A fin according to claim 2, wherein the proportion of solids of the proteinaceous substance comprise substantially 5 to 15 percent of the solids of the hydrophilic coating.
Claim 7
Dependent Claim
29 words
A fin according to claim 2, wherein the hydrophilic coating on the surface of the substrate has a solids content of not substantially more than 2 g/m 2 .
Claim 8
Dependent Claim
16 words
A fin according to claim 1, wherein said water soluble coating material comprises an acrylic paint.
Claim 9
Dependent Claim
15 words
A fin according to claim 1, wherein said hydrophilic coating further comprises a nonionic surfactant.
Claim 10
Dependent Claim
13 words
A fin according to claim 8, wherein said surfactant comprises polyoxyethylene nonylphenyl ether.
Claim 11
Dependent Claim
28 words
A fin according to claim 1, wherein the ratio between solids of the proteinaceous substance and solids of the water soluble coating material is substantially 1 to 2.
Claim 12
Independent Claim
46 words
A method for manufacturing a fin for a heat exchanger, comprising: obtaining a metallic substrate; applying a water-based coating composition comprising a proteinaceous substance having a peptide bond and a water soluble coating material to a surface of the substrate, thereby forming a hydrophilic coating thereon.
Claim 13
Independent Claim
46 words
A method for manufacturing a fin for a heat exchanger, comprising: obtaining a metallic substrate; applying a water-based coating composition comprising a proteinaceous substance having a peptide bond and a water soluble coating material to a surface of the substrate, thereby forming a hydrophilic coating thereon.
Claim 14
Dependent Claim
21 words
A method according to claim 11, wherein the metallic substrate is selected from the group consisting of aluminum and aluminum alloys.
Claim 15
Dependent Claim
16 words
A method according to claim 12, wherein said water-based coating composition comprises an aqueous gelatin solution.
Claim 16
Dependent Claim
16 words
A method according to claim 12, wherein said water-based coating composition further comprises an acrylic paint.
Claim 17
Dependent Claim
16 words
A method according to claim 12, wherein said water-based coating composition further comprises a nonionic surfactant.
Claim 18
Dependent Claim
26 words
A method according to claim 12, wherein said proteinaceous substance is selected from the group consisting of gelatin, casein and proteinaceous substances containing L-proline or L-oxyproline.
Claim 19
Dependent Claim
27 words
A method according to claim 16, wherein, after application, the water-based coating composition is dried at a temperature substantially in the range of 100° to 250° C.
Claim 20
Dependent Claim
19 words
A method according to claim 17, wherein said temperature is substantially in the range of 180° to 220° C.
References Cited (Backward Citations)
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |