Patent US4049185A successfully refreshed from Google Patents.
US4049185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming double extruded mount
Assignee: Luvata Ohio Inc
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Filing: 1977-03-11
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Granted: 1977-09-20
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Expires: 1997-03-11
Abstract
Abstract A process for the formation of a mount for a semi-conductor, such as a rectifier or the like, in which a steel ring and a steel tube are brazed in position on the upper surface of a previously formed hexagonal copper billet, following which the parts are cold-formed in a plurality of extrusion steps for producing an accurately formed mount in which the copper material is work-hardened.
Inventors
- 👤 Russell A. Nippert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:37
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/14; B23K1/18; H; H10; H10W; H10W70/00; H10W70/01; H10W70/02; H10W70/027; Y; Y10; Y10S; Y10S29/00; Y10S29/047; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
The method of forming a mount for a solid state rectifier and the like which comprises a. forming a hexagonal shaped billet of high conductivity copper, b. brazing a steel ring on the upper surface of said billet, c. brazing a steel tube in position within said ring on the upper surface of said billet, d. cold-forming said billet in a first extrusion step to provide a recess in the upper face of said billet of the same diameter as the inner diameter of said tube and concurrently generating a weld-projection on the upper surface of said ring, e. and additionally cold-forming said billet in a second extrusion step to form a downwardly projecting stem thereon (and to additionally shape said weld projection), said first and second extrusion steps causing work-hardening of said brazed joints and of the copper of said billet.
Claim 2
Independent Claim
142 words
The method of forming a mount for a solid state rectifier and the like which comprises a. forming a hexagonal shaped billet of high conductivity copper, b. brazing a steel ring on the upper surface of said billet, c. brazing a steel tube in position within said ring on the upper surface of said billet, d. cold-forming said billet in a first extrusion step to provide a recess in the upper face of said billet of the same diameter as the inner diameter of said tube and concurrently generating a weld-projection on the upper surface of said ring, e. and additionally cold-forming said billet in a second extrusion step to form a downwardly projecting stem thereon (and to additionally shape said weld projection), said first and second extrusion steps causing work-hardening of said brazed joints and of the copper of said billet.
Claim 3
Dependent Claim
38 words
The method of claim 1 in which the forming of the billet includes the forming of a recess on the upper surface of the billet, and using the recess to accurately locate the steel tube in proper position.
Claim 4
Dependent Claim
30 words
The method of claim 1 in which the forming of the billet includes forming a central pedestal, and using the pedestal to accurately locate the steel tube in proper position.
References Cited (Backward Citations)
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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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |