US3989096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation resistant brazing
Assignee: ICM Krebsoge Inc
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Filing: 1973-11-01
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Granted: 1976-11-02
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Expires: 1993-11-01
Abstract
Abstract Diffusion-alloying of aluminum into copper brazed joints and structures, particularly for turbine engine regenerator cores.
Inventors
- 👤 Gordon E. Allardyce
- 👤 Amedee Roy
- 👤 Claude Belleau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:57
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/18; C23C10/20; B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; C23C26/00; C23C26/02; Y; Y10; Y10S; Y10S165/00; Y10S165/905; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49357
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
40 words
A regenerator core comprising a rim, hub and matrix, the matrix being formed of pieces of metal joined by brazed joints comprised of a copper-aluminum alloy containing up to a maximum of about 15% aluminum by weight, balance essentially copper.
Claim 2
Dependent Claim
40 words
A regenerator core comprising a rim, hub and matrix, the matrix being formed of pieces of metal joined by brazed joints comprised of a copper-aluminum alloy containing up to a maximum of about 15% aluminum by weight, balance essentially copper.
Claim 3
Dependent Claim
61 words
A regenerator core having a matrix defining a hot face and a cold face and a number of intermediate brazed joints, the joints being comprised of a copper-aluminum alloy, the aluminum content of which varies from a low value in the area of the cold face side of the matrix to a high value at the hot face of the matrix.
Claim 4
Dependent Claim
61 words
A regenerator core having a matrix defining a hot face and a cold face and a number of intermediate brazed joints, the joints being comprised of a copper-aluminum alloy, the aluminum content of which varies from a low value in the area of the cold face side of the matrix to a high value at the hot face of the matrix.
Claim 5
Dependent Claim
20 words
The core of claim 2 wherein the high value is limited to a maximum of about 15% by weight aluminum.
Claim 6
Dependent Claim
18 words
The core of claim 2 wherein the high value is between about 10% to 15% by weight aluminum.
Claim 7
Dependent Claim
14 words
The core of claim 2 wherein the matrix is essentially made up of steel.
Claim 8
Dependent Claim
15 words
The core of claim 2 wherein the matrix is comprised of steel containing aluminum also.
Claim 9
Dependent Claim
12 words
The core of claim 6 wherein the steel is 430 stainless steel.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |