US4482611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic parts
Assignee: Toshiba Corp
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Filing: 1982-12-20
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Granted: 1984-11-13
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Expires: 2002-12-20
Abstract
Abstract An electronic part composed of an alloy comprising, as a basic metal or metals, Cr and Zr with the total amount thereof being between 0.3 and 2.0% by weight (provided that the amount of Cr is 1.5% by weight or less and that of Zr is 1.0% by weight or less) and Cu as a balance, the surface of said part having been coated with Sn. The electronic part according to the present invention is excellent in the wetting property of a solder, weather resistance of a solder and bonding property to Au and Al.
Inventors
- 👤 Koichi Teshima
- 👤 Masakazu Yamada
- 👤 Toshiharu Sakurai
- 👤 Takemi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:13
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/456; H10W72/00; H10W90/00; H10W90/701; H10W90/751; H10W90/753; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12708; Y10T428/12715
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
185 words
An electronic part comprising: (i) a high strength Cr and Zr deposition type copper alloy consisting essentially of Cu, Cr in an amount more than 0.3% and less than 1.5% by weight, and Zr in an amount of about 1% by weight or less, the total amount of Cr and Zr being between about 0.3% and about 2.0% by weight, said copper alloy being the product of a process comprising the steps of (a) dissolving in substantially pure Cu at least one of Cr, in an amount more than 0.3% and less than about 1.5% by weight, or Zr, in an amount of about 1% by weight or less, the total amount of Cr and Zr being between about 0.3% and about 2.0% by weight, (b) preparing a workpiece from the solution prepared in step (a), (c) hot rolling said workpiece at a temperature between about 600° and about 900° C., (d) annealing said workpiece after hot rolling, and (e) shaping said workpiece after step (d) to form said electronic part; and (ii) a coating on said high strength copper alloy, said coating comprising Sn.
Claim 2
Dependent Claim
185 words
An electronic part comprising: (i) a high strength Cr and Zr deposition type copper alloy consisting essentially of Cu, Cr in an amount more than 0.3% and less than 1.5% by weight, and Zr in an amount of about 1% by weight or less, the total amount of Cr and Zr being between about 0.3% and about 2.0% by weight, said copper alloy being the product of a process comprising the steps of (a) dissolving in substantially pure Cu at least one of Cr, in an amount more than 0.3% and less than about 1.5% by weight, or Zr, in an amount of about 1% by weight or less, the total amount of Cr and Zr being between about 0.3% and about 2.0% by weight, (b) preparing a workpiece from the solution prepared in step (a), (c) hot rolling said workpiece at a temperature between about 600° and about 900° C., (d) annealing said workpiece after hot rolling, and (e) shaping said workpiece after step (d) to form said electronic part; and (ii) a coating on said high strength copper alloy, said coating comprising Sn.
Claim 3
Dependent Claim
23 words
An electronic part according to claim 1, wherein the amount of Cr is in the range of from 0.5 to 1.0% by weight.
Claim 4
Dependent Claim
23 words
An electronic part according to claim 1, wherein the amount of Zr is in the range of from 0.05 to 0.5% by weight.
Claim 5
Dependent Claim
19 words
An electronic part according to claim 1, wherein the thickness of the coating is not less than 2 microns.
Claim 6
Dependent Claim
23 words
An electronic part according to claim 4, wherein the thickness of the coating is in the range of from 3 to 20 microns.
Claim 7
Dependent Claim
15 words
An electronic part according to claim 1, wherein said electronic part is a lead frame.
Claim 8
Dependent Claim
22 words
An electronic part according to claim 1, wherein said annealing is at about 750° C. for a period of approximately one hour.
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) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |