Patent US3960208A successfully refreshed from Google Patents.
US3960208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for providing heat transfer with resistance to erosion-corrosion in aqueous environment
Assignee: Rio Tinto Switzerland AG
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Filing: 1974-12-13
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Granted: 1976-06-01
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Expires: 1994-12-13
Abstract
Abstract A composite aluminum article having increased resistance to erosion corrosion in aqueous environments comprising an aluminum base alloy cladding consisting essentially of 0.8 to 1.3% zinc, 0.7% maximum silicon plus iron, 0.10% maximum copper, 0.10% maximum manganese, 0.10% maximum magnesium, balance essentially aluminum, bonded to at least one side of an aluminum base alloy core consisting essentially of manganese from 1.0 to 1.5%, chromium from 0.1 to 0.4%, copper from 0.05 to 0.4%, balance essentially aluminum.
Inventors
- 👤 William H. Anthony
- 👤 James M. Popplewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:05
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/089; B; B32; B32B; B32B15/00; B32B15/01; B32B15/016; C; C22; C22C; C22C21/00; F01; F01P; F01P11/00; F01P11/06; F28F19/00; F28F19/02; F28F19/06; F28F21/081; F28F21/084; F01P2011/066; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A process for providing heat transfer with resistance to erosion corrosion in an aqueous environment which comprises: A. providing metal tubing comprising an aluminum base alloy cladding consisting essentially of 0.8 to 1.3% zinc, 0.7% maximum silicon plus iron, 0.10% maximum copper, 0.10% maximum manganese, 0.10% maximum magnesium, balance essentially aluminum bonded to at least one side of an aluminum base alloy core consisting essentially of manganese from 1.0 to 1.5%, chromium from 0.1 to 0.4%, copper from 0.05 to 0.4%, balance essentially aluminum, said metal tubing having entrance and exits ends having a wall thickness no larger than 0.1 inch; B. affixing the said entrance and exit ends to two tube sheets; C. passing a first aqueous liquid through the tubing; D. contacting the external surface of said tubing with a fluid in heat exchange relationship with said fluid.
Claim 2
Dependent Claim
140 words
A process for providing heat transfer with resistance to erosion corrosion in an aqueous environment which comprises: A. providing metal tubing comprising an aluminum base alloy cladding consisting essentially of 0.8 to 1.3% zinc, 0.7% maximum silicon plus iron, 0.10% maximum copper, 0.10% maximum manganese, 0.10% maximum magnesium, balance essentially aluminum bonded to at least one side of an aluminum base alloy core consisting essentially of manganese from 1.0 to 1.5%, chromium from 0.1 to 0.4%, copper from 0.05 to 0.4%, balance essentially aluminum, said metal tubing having entrance and exits ends having a wall thickness no larger than 0.1 inch; B. affixing the said entrance and exit ends to two tube sheets; C. passing a first aqueous liquid through the tubing; D. contacting the external surface of said tubing with a fluid in heat exchange relationship with said fluid.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein said cladding is bonded to opposing sides of said core.
Claim 4
Dependent Claim
33 words
A process according to claim 1 wherein said cladding contains up to 0.7% silicon plus iron, up to 0.1% copper, up to 0.1% manganese, up to 0.1% magnesium, others 0.05% each, total 0.15%.
Claim 5
Dependent Claim
28 words
A process according to claim 1 wherein said core contains up to 0.6% silicon, up to 0.7% iron, up to 0.1% zinc, and others 0.05% each, total 0.15%.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein said tubing has a wall thickness of from 0.010 to 0.030 inch.
Claim 7
Dependent Claim
18 words
A process according to claim 1 including the step of connecting secondary heat exchange surface to said tubing.
Claim 8
Dependent Claim
21 words
A process according to claim 6 wherein the secondary heat exchange surface is corrugated fin stock material bonded to said tubing.
Claim 9
Dependent Claim
24 words
A process according to claim 7 wherein said tubing is affixed to two parallel headers connected by a plurality of said tubing perpendicular therewith.
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |