US4368776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum heat exchanger
Assignee: Strata-G Solutions LLC
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Filing: 1981-06-11
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Granted: 1983-01-18
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Expires: 2001-06-11
Abstract
Abstract An aluminum heat exchanger with excellent corrosion resistance and particularly suited for adaptation as radiator for automobiles, the heat exchanger having a 2- or 3-layer coating film structure consisting of a zinc-diffused layer formed on the surface of an aluminum base and a waterproof organic film formed on the zinc-diffused layer with or without a phosphoric acid-chromate coating therebetween, whereby the surface of the aluminum base is not directly contacted with at least the water-containing heat exchange medium is provided.
Inventors
- 👤 Junichi Negita
- 👤 Yuichiro Yamada
- 👤 Hideaki Kaneko
- 👤 Takao Ogino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:58
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/02; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/05316; F28D1/05333; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
52 words
An aluminum heat exchanger comprising a plurality of aluminum tubes through which a heat exchange medium containing at least water is circulated, each of said tubes having its inner surface coated with a zinc-diffused layer and a water-proof resin coating of at least 3 μ in thickness formed on said zinc-diffused layer.
Claim 2
Dependent Claim
52 words
An aluminum heat exchanger comprising a plurality of aluminum tubes through which a heat exchange medium containing at least water is circulated, each of said tubes having its inner surface coated with a zinc-diffused layer and a water-proof resin coating of at least 3 μ in thickness formed on said zinc-diffused layer.
Claim 3
Dependent Claim
20 words
An aluminum heat exchanger according to claim 1, wherein the zinc-diffused layer has a depth of at least 10 μ.
Claim 4
Dependent Claim
27 words
An aluminum heat exchanger according to claim 1, wherein the water-proof resin coating is made of an epoxy-phenol type resin and has a thickness of 3-5 μ.
Claim 5
Dependent Claim
113 words
An aluminum heat exchanger according to claim 1, wherein the water-proof resin coating comprises a vinyl chloride-vinyl acetate copolymer, a vinylidene chloride-vinyl chloride copolymer, a modified vinyl type resin obtained by modifying a vinyl chloride-vinyl acetate copolymer with a phenol resin or an epoxy resin, a thermosetting vinyl type resin obtained by adding an amino resin to a vinyl chloride-vinyl acetate copolymer, a vinyl-organo resin obtained by dispersing powdered vinyl chloride resin in a solvent, an alcohol-soluble thermosetting phenol resin, an epoxy resin selected from a butyral resin, a modified phenol resin, an epoxy-amino resin, an epoxy-polyamide resin or an epoxy-ester resin, an oil varnish, a thermosetting acrylic resin or a fluorine resin.
Claim 6
Dependent Claim
64 words
An aluminum heat exchanger comprising a plurality of aluminum tubes through which a heat exchange medium containing at least water is circulated, each of said tubes having its inner surface coated with a zinc-diffused layer, a phosphoric acid-chromate coating film formed on said zinc-diffused layer and a water-proof resin coating of at least 3 μ in thickness formed on said phosphoric acid-chromate coating film.
Claim 7
Dependent Claim
64 words
An aluminum heat exchanger comprising a plurality of aluminum tubes through which a heat exchange medium containing at least water is circulated, each of said tubes having its inner surface coated with a zinc-diffused layer, a phosphoric acid-chromate coating film formed on said zinc-diffused layer and a water-proof resin coating of at least 3 μ in thickness formed on said phosphoric acid-chromate coating film.
Claim 8
Dependent Claim
20 words
An aluminum heat exchanger according to claim 5, wherein the zinc-diffused layer has a depth of at least 10 μ.
Claim 9
Dependent Claim
24 words
An aluminum heat exchanger according to claim 5, wherein the phosphoric acid-chromate coating film is provided with a coverage of 0.4-0.5 g/m 2 .
Claim 10
Dependent Claim
26 words
An aluminum heat exchanger according to claim 5, wherein the water-proof resin coating is made of an epoxy-phenol resin and has a thickness of 3-5 μ.
Claim 11
Dependent Claim
114 words
An aluminum heat exchanger according to claim 5, wherein the water-proof resin coating comprises a vinyl chloride-vinyl acetate copolymer, a vinylidene chloride-vinyl chloride copolymer, a modified vinyl resin obtained by modifying a vinyl chloride-vinyl acetate copolymer with a phenol resin or an epoxy resin, a thermosetting vinyl resin obtained by adding an amino resin to a vinyl chloride-vinyl acetate copolymer, a vinyl-organo resin obtained by dispersing powdered vinyl chloride resin in a solvent, an alcohol-soluble thermosetting phenol resin, an epoxy resin selected from a butyral resin, a modified phenol resin, an epoxy-amino resin, an epoxy-phenol resin, an epoxy-polyamide resin or an epoxy-ester resin, an oil varnish, a thermosetting acrylic resin or a fluorine resin.
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) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |