Patent US2121311A successfully refreshed from Google Patents.
US4674566A
Expired / Lapsed
US
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Corrosion resistant modified Cu-Zn alloy for heat exchanger tubes
Assignee: Olin Corp
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Filing: 1985-02-14
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Granted: 1987-06-23
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Expires: 2005-02-14
Abstract
Abstract The present invention relates to a heat exchanger assembly having a plurality of heat exchange fluid passageways formed from a modified copper-zinc alloy. The copper-zinc alloy contains from about 21% to about 39% zinc, from about 1% to about 5% nickel, from about 0.02% to about 1% arsenic and the balance essentially copper. In a preferred embodiment, the copper-zinc alloy consists essentially of from about 25% to about 35% zinc, from about 2.5% to about 3.5% nickel, from about 0.03% to about 0.06% arsenic and the balance essentially copper. The heat exchanger assemblies of the present invention have particular utility as motor vehicle radiators.
Inventors
- 👤 Murray A. Heine
- 👤 Ned W. Polan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:06
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/06; C22C9/04; Y; Y10; Y10S; Y10S165/00; Y10S165/905
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
85 words
A heat exchanger having improved resistance to corrosive attack from a salt containing fluid, said heat exchanger comprising: a plurality of fluid passageways; each said passageway being formed from a copper base alloy consisting essentially of from about 1.0% to about 5.0% by weight nickel, from about 21.0% to about 39.0% by weight zinc, from about 0.02% to about 1.0% by weight arsenic and the balance essentially copper; and said copper base alloy providing said improved resistance to corrosive attack from said salt containing fluid.
Claim 2
Dependent Claim
85 words
A heat exchanger having improved resistance to corrosive attack from a salt containing fluid, said heat exchanger comprising: a plurality of fluid passageways; each said passageway being formed from a copper base alloy consisting essentially of from about 1.0% to about 5.0% by weight nickel, from about 21.0% to about 39.0% by weight zinc, from about 0.02% to about 1.0% by weight arsenic and the balance essentially copper; and said copper base alloy providing said improved resistance to corrosive attack from said salt containing fluid.
Claim 3
Dependent Claim
18 words
The heat exchanger of claim 1 further comprising at least one heat transfer surface bonded to said passageways.
Claim 4
Dependent Claim
20 words
The heat exchanger of claim 1 further comprising at least one tank and header assembly joined to said fluid passageways.
Claim 5
Dependent Claim
19 words
The heat exchanger of claim 1 further comprising at least one fluid inlet and at least one fluid outlet.
Claim 6
Dependent Claim
59 words
The heat exchanger of claim 1 further comprising: two spaced apart tank and header assemblies, one of said tank and header assemblies having a fluid inlet associated therewith and the other of said tank and header assemblies having a fluid outlet associated therewith; and each of said passageways being positioned between and joined to said tank and header assemblies.
Claim 7
Dependent Claim
34 words
The heat exchanger of claim 5 further comprising: said fluid passageways comprising a plurality of tubes; and each of said tubes having a metal or metal alloy fin assembly bonded to its outer surface.
Claim 8
Dependent Claim
15 words
The heat exchanger of claim 6 further comprising: each fin assembly having a corrugated configuration.
Claim 9
Dependent Claim
24 words
The heat exchanger of claim 6 further comprising: said tank and header assemblies and said fin assemblies being formed from a copper base alloy.
Claim 10
Dependent Claim
22 words
The heat exchanger of claim 1 wherein each of said fluid passageways comprises a tube assembly having a soldered or welded seam.
Claim 11
Dependent Claim
15 words
The heat exchanger of claim 1 wherein said heat exchanger comprises a motor vehicle radiator.
Claim 12
Dependent Claim
45 words
The heat exchanger of claim 1 wherein said copper base alloy consists essentially of from about 2.5% to about 3.5% by weight nickel, from about 25.0% to about 35.0% by weight zinc, from about 0.03% to about 0.06% by weight arsenic and the balance copper.
Claim 13
Dependent Claim
68 words
A copper base alloy having improved resistance to attack from a salt containing fluid for use in heat exchanger applications, said alloy consisting essentially of from about 2.5% to about 5.0% by weight nickel to reducing the depth of attack caused by said salt containing fluid, from about 21.0% to about 39.0% by weight zinc, from about 0.02% to about 1.0% by weight arsenic, and the balance copper.
Claim 14
Dependent Claim
68 words
A copper base alloy having improved resistance to attack from a salt containing fluid for use in heat exchanger applications, said alloy consisting essentially of from about 2.5% to about 5.0% by weight nickel to reducing the depth of attack caused by said salt containing fluid, from about 21.0% to about 39.0% by weight zinc, from about 0.02% to about 1.0% by weight arsenic, and the balance copper.
Claim 15
Dependent Claim
42 words
The copper base alloy of claim 12 further consisting essentially of from about 2.5% to about 3.5% by weight nickel, from about 25.0% to about 35.0% by weight zinc, from about 0.03% to about 0.06% by weight arsenic and the balance copper.
Claim 16
Dependent Claim
33 words
The copper base alloy of claim 12 wherein said arsenic and said nickel content of said alloy reduce the mean pit depth and the maximum pit depth caused by said salt containing fluid.
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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) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |