Patent US3670397A successfully refreshed from Google Patents.
US3670397A
Expired / Lapsed
US
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Method of fabricating a laminated metal member
Assignee: Boeing North American Inc
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Filing: 1970-02-24
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Granted: 1972-06-20
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Expires: 1990-02-24
Abstract
Abstract A laminated, relatively massive metal member requiring a minimum of finish machining is made by cutting a number of thin metal laminae in the shape of the final member. The laminae are stacked into the shape of the member, and held therein by suitable restraining means. The laminae stack is then diffusion bonded together at an elevated temperature and pressure in a nonoxidizing environment.
Inventors
- 👤 Joseph C Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:15
CPC Classifications
B; B23; B23K; B23K20/00; B23P; B23P2700/00; B23P2700/12; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12639; Y10T428/12771; Y10T428/12806
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A method of fabricating a laminated, complex-shaped, metal member requiring a minimum of final machining which comprises fabricating a plurality of shaped, relatively thin metal laminae designed to be arranged into said member, stacking said laminae substantially parallel to each other to form the shape of said member, placing the resulting laminae stack within an enclosed metal retort having disposed therein a restraining die shaped to receive and to conform with the shape of said laminae stack, drawing a vacuum on the resulting assembly, and then applying suitable heat and pressure to said assembly in order to diffusion bond said laminae together.
Claim 2
Independent Claim
102 words
A method of fabricating a laminated, complex-shaped, metal member requiring a minimum of final machining which comprises fabricating a plurality of shaped, relatively thin metal laminae designed to be arranged into said member, stacking said laminae substantially parallel to each other to form the shape of said member, placing the resulting laminae stack within an enclosed metal retort having disposed therein a restraining die shaped to receive and to conform with the shape of said laminae stack, drawing a vacuum on the resulting assembly, and then applying suitable heat and pressure to said assembly in order to diffusion bond said laminae together.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein the said laminae are of titanium, and said diffusion bonding is conducted under coordinated timE-temperature-pressure conditions of about 3 1/2 - 4 1/2 hours, 1,500*-1,650* F, and 250-800 psi.
Claim 4
Dependent Claim
38 words
The method of claim 1 wherein said laminae are of titanium and said retort and said restraining die are of stainless steel, and wherein surfaces of said stainless steel contacting said titanium are treated to prevent bonding therewith.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein said heat and pressure are applied by placing said retort assembly between heating platens and then applying unidirectional compressive force to the resulting assembly.
References Cited (Backward Citations)
US1744588A
Cited
US2700632A
Cited
US2998646A
Cited
US3186083A
Cited
US3133346A
Cited
US3207503A
Cited
US3345735A
Cited
US3393445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |