US4498121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper alloys for suppressing growth of Cu-Al intermetallic compounds
Assignee: Olin Corp
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Filing: 1983-01-13
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Granted: 1985-02-05
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Expires: 2003-01-13
Abstract
Abstract Copper alloys are disclosed which may be bonded to aluminum containing members with reduced formation of undesirable copper-aluminum intermetallic compounds. The copper alloys consist essentially of about 15% to about 30% nickel and the balance essentially copper. The nickel addition in the alloys suppresses the nucleation rate and the subsequent growth rate of copper-aluminum intermetallic compounds. The copper alloys of the instant invention have particular utility in integrated circuit assemblies as lead frames, lead wires and beam lead tapes.
Inventors
- 👤 John F. Breedis
- 👤 Julius C. Fister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:12
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/002; C; C22; C22C; C22C9/00; C22C9/06; H; H10; H10W; H10W70/00; H10W70/40; H10W70/456; H10W70/60; H10W70/67; H10W70/68; H10W70/682; H10W70/685; H10W72/00; H10W72/01; H10W72/015; H10W72/01565; H10W72/071; H10W72/075; H10W72/07531; H10W72/07532; H10W72/07533; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W72/5525; H10W72/59; H10W72/90; H10W72/951; H10W72/952; H10W90/00; H10W90/701; H10W90/751; H10W90/756; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
A circuit assembly comprising: a leadwire formed from an aluminum containing material; a lead frame formed from a copper containing material; said leadwire and lead frame being bonded together, wherein the improvement comprises: said lead frame being formed from a copper base alloy consisting essentially of at least about 15% nickel and the balance essentially copper, said copper base alloy suppressing the growth of copper-aluminum intermetallic compounds.
Claim 2
Dependent Claim
67 words
A circuit assembly comprising: a leadwire formed from an aluminum containing material; a lead frame formed from a copper containing material; said leadwire and lead frame being bonded together, wherein the improvement comprises: said lead frame being formed from a copper base alloy consisting essentially of at least about 15% nickel and the balance essentially copper, said copper base alloy suppressing the growth of copper-aluminum intermetallic compounds.
Claim 3
Dependent Claim
26 words
The circuit assembly of claim 1 further comprising: said copper base alloy consisting essentially of about 15% to about 30% nickel and the balance essentially copper.
Claim 4
Dependent Claim
26 words
The circuit assembly of claim 1 further comprising: said copper base alloy consisting essentially of about 19% to about 26% nickel and the balance essentially copper.
Claim 5
Dependent Claim
34 words
The circuit assembly of claim 1 wherein: said circuit assembly comprises an integrated circuit assembly. said second member comprises a lead frame; and said first member comprises a leadwire bonded to said lead frame.
Claim 6
Dependent Claim
30 words
The circuit assembly of claim 1 wherein: said second member comprises a composite structure having said copper base alloy as a cladding material and a metal or metal alloy core.
Claim 7
Dependent Claim
18 words
The circuit assembly of claim 1 wherein: said copper base alloy further includes up to about 1% aluminum.
Claim 8
Dependent Claim
18 words
The circuit assembly of claim 1 wherein: said copper base alloy further includes up to about 1% silicon.
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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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |