US4781320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of a heat exchanger
Assignee: Marelli Corp
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Filing: 1987-04-27
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Granted: 1988-11-01
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Expires: 2007-04-27
Abstract
Abstract A method for the production of a heat exchanger having a core part thereof formed by joining a tube of aluminum material and heat-transfer fins of aluminum material with a brazing material, which method is characterized by effecting said brazing by the use of a flux obtained by suspending a potassium fluoroaluminate complex in an aqueous solution of a pigment-forming water-soluble compound.
Inventors
- 👤 Tatsuya Fujiyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:31
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; B23K35/00; B23K35/22; B23K35/36; B23K35/3601; B23K35/3603; B23K35/3605; F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; F28D1/0478; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/126
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A method for the production of a heat exchanger having a core part thereof formed by joining a tube of aluminum material and heat-transfer fins of aluminum material with a brazing material, which method is characterized by effecting said brazing by the use of a flux obtained by suspending a potassium fluoroaluminate complex in an aqueous solution of a pigment-forming water-soluble compound, wherein said pigment-forming water-soluble compound is a mixture of nickel sulfate with potassium molybdate.
Claim 2
Independent Claim
76 words
A method for the production of a heat exchanger having a core part thereof formed by joining a tube of aluminum material and heat-transfer fins of aluminum material with a brazing material, which method is characterized by effecting said brazing by the use of a flux obtained by suspending a potassium fluoroaluminate complex in an aqueous solution of a pigment-forming water-soluble compound, wherein said pigment-forming water-soluble compound is a mixture of nickel sulfate with potassium molybdate.
Claim 3
Dependent Claim
32 words
A method according to claim 1, wherein said pigment-forming water-soluble compound is incorporated in an amount in the range of 2 to 60% by weight, based on the amount of said complex.
Claim 4
Dependent Claim
24 words
A method according to claim 2, wherein said flux is applied in a ratio in the range of 1 to 10 g/m 2 .
Claim 5
Dependent Claim
21 words
A method according to claim 2, wherein said potassium fluoroaluminate complex comprises the two complexes of potassium hexafluoroaluminate and potassium tetrafluoroaluminate.
Claim 6
Dependent Claim
34 words
A method according to claim 1, wherein nickel sulfate and potassium molybdate are incorporated each in an amount in the range of 1 to 30% by weight, based on the amount of said complex.
Claim 7
Dependent Claim
34 words
A method according to claim 4, wherein nickel sulfate and potassium molybdate are incorporated each in an amount in the range of 10 to 20% by weight, based on the amount of said complex.
Claim 8
Dependent Claim
24 words
A method according to claim 1, wherein said brazing is carried out at a temperature in the range of about 595° to 620° C.
References Cited (Backward Citations)
JPS58171580A
Cited
EP0131444A1
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US4645119A
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EP0140267B1
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US4705206A
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JPS6149771A
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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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |