US3891784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing oxidation resistant brazed joints
Assignee: Old Carco LLC
•
Filing: 1973-11-01
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Granted: 1975-06-24
•
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
- 👤 Roy Amedee
- 👤 Claude Belleau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:53
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; C; C23; C23C; C23C10/00; C23C10/02; C23C10/18; C23C10/20; C23C10/28; C23C10/30; C23C26/00; C23C26/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
45 words
A METHOD OF PREPARING OXIDATION RESISTANT BRAZED JOINTS COMPRISING THE STEPS OF: PROVIDING A STRUCTURE HAVING A COPPER BRAZED JOINT, COATING THE COPPER JOINT WITH ALUMINUM AND HEATING THE STRUCTURE AT AN ELEVATED TEMPERATURE FOR A TIME SUFFICIENT TO CAUSE DIFFUSION OF ALUMINUM SUBSTANTIALLY THROUGHOUT
Claim 2
Independent Claim
45 words
A METHOD OF PREPARING OXIDATION RESISTANT BRAZED JOINTS COMPRISING THE STEPS OF: PROVIDING A STRUCTURE HAVING A COPPER BRAZED JOINT, COATING THE COPPER JOINT WITH ALUMINUM AND HEATING THE STRUCTURE AT AN ELEVATED TEMPERATURE FOR A TIME SUFFICIENT TO CAUSE DIFFUSION OF ALUMINUM SUBSTANTIALLY THROUGHOUT
Claim 3
Dependent Claim
16 words
The method according to claim 1 wherein the heating step is carried in a hydrogen atmosphere.
Claim 4
Dependent Claim
21 words
The method according to claim 1 wherein the aluminum is applied to the copper joint in a form of a slurry.
Claim 5
Dependent Claim
23 words
The method according to claim 3 wherein the structure is dipped into the aluminum slurry to coat the copper joint and the structure.
Claim 6
Dependent Claim
39 words
The method according to claim 4 wherein the amount of slurry applied to the structure in terms of slurry weight gain (SWG) is between about 1 percent and 2 percent whereby the resultant copper-aluminum alloy is substantially oxidation resistant.
References Cited (Backward Citations)
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US3235959A
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US3395027A
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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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |