Patent US4246960A successfully refreshed from Google Patents.
US4246960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail safe heat exchanger
Assignee: Olin Corp
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Filing: 1979-03-26
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Granted: 1981-01-27
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Expires: 1999-03-26
Abstract
Abstract A multiple passage metal heat exchanger is disclosed which contains a metal barrier between sets of passageways. The barrier is cathodic to the metal of the heat exchanger and prevents intermixing of different heat transfer fluids due to corrosion.
Inventors
- 👤 James M. Popplewell
- 👤 Sheldon H. Butt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:19
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/12; F28F3/14; F28F19/00; F28F19/004; Y; Y10; Y10S; Y10S165/00; Y10S165/905; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/933
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
A fail safe metal heat exchanger comprising copper or a copper alloy, said heat exchanger comprising juxtaposed primary and secondary fluid passageways integral with and separated by a corrosion barrier comprising nickel or a nickel alloy which is noble to said copper or copper alloy of the remainder of said heat exchanger; whereby said corrosion barrier is adapted to prevent intermixing between a fluid in said primary passageway and a fluid in said secondary passageway.
Claim 2
Dependent Claim
75 words
A fail safe metal heat exchanger comprising copper or a copper alloy, said heat exchanger comprising juxtaposed primary and secondary fluid passageways integral with and separated by a corrosion barrier comprising nickel or a nickel alloy which is noble to said copper or copper alloy of the remainder of said heat exchanger; whereby said corrosion barrier is adapted to prevent intermixing between a fluid in said primary passageway and a fluid in said secondary passageway.
Claim 3
Dependent Claim
14 words
The heat exchanger of claim 1 wherein said corrosion barrier comprises a metallic foil.
Claim 4
Dependent Claim
14 words
The heat exchanger of claim 1 wherein said corrosion barrier comprises a nickel sheet.
Claim 5
Dependent Claim
124 words
A composite fail safe metal heat exchanger comprising: a first metal panel comprising copper or a copper alloy having at least one fluid passageway; a second metal panel comprising copper or a copper alloy having at least one fluid passageway; said first and second metal panels being arranged in juxtaposition; a substantially continuous corrosion barrier; said corrosion barrier comprising nickel or a nickel alloy which is noble to the metal of said first and second panels; and said corrosion barrier being located between and in intimate contact with said first and second panels; whereby said corrosion barrier is adapted to prevent intermixing between a fluid in said passageway of said first metal panel and a fluid in said passageway of said second metal panel.
Claim 6
Dependent Claim
124 words
A composite fail safe metal heat exchanger comprising: a first metal panel comprising copper or a copper alloy having at least one fluid passageway; a second metal panel comprising copper or a copper alloy having at least one fluid passageway; said first and second metal panels being arranged in juxtaposition; a substantially continuous corrosion barrier; said corrosion barrier comprising nickel or a nickel alloy which is noble to the metal of said first and second panels; and said corrosion barrier being located between and in intimate contact with said first and second panels; whereby said corrosion barrier is adapted to prevent intermixing between a fluid in said passageway of said first metal panel and a fluid in said passageway of said second metal panel.
Claim 7
Dependent Claim
20 words
The heat exchanger of claim 4 wherein said first and second metal panels are of the tube in sheet type.
Claim 8
Dependent Claim
26 words
The heat exchanger of claim 4 wherein said first and second panels and said corrosion barrier are metallurgically bonded together to form said composite heat exchanger.
Claim 9
Dependent Claim
35 words
The heat exchanger of claim 4 wherein said first and second panels are diffusion bonded to said corrosion barrier whereby a diffusion zone exists at the interface of each said panel and said corrosion barrier.
Claim 10
Dependent Claim
14 words
The heat exchanger of claim 7 wherein said diffusion zone comprises copper nickel alloy.
Claim 11
Dependent Claim
26 words
The heat exchanger of claim 4 wherein said first and second panels and said corrosion barrier are mechanically fastened together to form said composite heat exchanger.
Claim 12
Dependent Claim
14 words
The heat exchanger of claim 4 wherein said corrosion barrier comprises a metallic sheet.
Claim 13
Dependent Claim
14 words
The heat exchanger of claim 4 wherein said corrosion barrier comprises a nickel foil.
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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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |