Patent US3918625A successfully refreshed from Google Patents.
US3918625A
Expired / Lapsed
US
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Method of making a double extruded semiconductor joint
Assignee: Luvata Ohio Inc
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Filing: 1974-10-03
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Granted: 1975-11-11
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Expires: 1994-10-03
Abstract
Abstract A heat sink mount for a pressurized semiconductor device is formed in two extrusion stages including a first bi-metal extrusion stage in which a steel ring brazed to the top of a copper billet is extruded together with the main body of copper to form a cup at the top of the main body defined by a depending collar integral with said ring and a mounting stem, a tube with a flared lower end is placed in the cup and a second extrusion is performed on the main body to cause flow of the collar material and to lock it into the flared end of the tube to form a tight joint.
Inventors
- 👤 Russell A Nippert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:15
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/20; H10W70/01; H10W70/02; H10W70/027; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49925; Y10T29/49934; Y10T403/00; Y10T403/49; Y10T403/4991
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
THE METHOD OF FORMING A MOUNT FOR A PRESSURIZED SEMICONDUCTOR DEVICE COMPRISING SILVER BRAZING A STEEL RING TO THE UPPER SURFACE OF A COPPER BILLET, EXTRUDING BILLET TO FORM A DOWNWARDLY OPENING COLLAR ON THE RING, AN OPEN CUP IN THE MAIN BODY OF THE MOUNT AND A LOWER STEM FORMING A STEEL TUBE WITH A FLARED LOWER END, MOUNTING THE FLARED END OF SAID TUBE IN SAID CUP, AND EXTRUDING THE MAIN BODY OF THE MOUNT TO CAUSE THE METAL TO FLOW-LOCK THE FLARED END OF THE TUBE FORMING A SECURE CONNECTION.
Claim 2
Independent Claim
93 words
THE METHOD OF FORMING A MOUNT FOR A PRESSURIZED SEMICONDUCTOR DEVICE COMPRISING SILVER BRAZING A STEEL RING TO THE UPPER SURFACE OF A COPPER BILLET, EXTRUDING BILLET TO FORM A DOWNWARDLY OPENING COLLAR ON THE RING, AN OPEN CUP IN THE MAIN BODY OF THE MOUNT AND A LOWER STEM FORMING A STEEL TUBE WITH A FLARED LOWER END, MOUNTING THE FLARED END OF SAID TUBE IN SAID CUP, AND EXTRUDING THE MAIN BODY OF THE MOUNT TO CAUSE THE METAL TO FLOW-LOCK THE FLARED END OF THE TUBE FORMING A SECURE CONNECTION.
Claim 3
Independent Claim
108 words
The method of forming a mount for a pressurized semiconductor device comprising silver brazing a steel ring to the upper surface of a copper billet, extruding the ring and the billet to form a downwardly opening collar on the ring, an open cup in the main body of the mount receiving said collar, and a lower stem on the billet, forming a steel tube with a flared lower end, mounting the flared end of said tube in said cup, and extruding the body of the mount to cause the metal of said collar to flow-lock the flared end of the tube forming a secure connection of high strength.
Claim 4
Independent Claim
108 words
The method of forming a mount for a pressurized semiconductor device comprising silver brazing a steel ring to the upper surface of a copper billet, extruding the ring and the billet to form a downwardly opening collar on the ring, an open cup in the main body of the mount receiving said collar, and a lower stem on the billet, forming a steel tube with a flared lower end, mounting the flared end of said tube in said cup, and extruding the body of the mount to cause the metal of said collar to flow-lock the flared end of the tube forming a secure connection of high strength.
Claim 5
Dependent Claim
13 words
The method of claim 1 in which the copper is cold-formed and work-hardened.
Claim 6
Dependent Claim
15 words
The method of claim 1 in which the copper is high conductivity oxygen-free copper alloy.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |