US4323759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical inter-connection method
Assignee: Welding Institute England
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Filing: 1980-02-21
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Granted: 1982-04-06
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Expires: 2000-02-21
Abstract
Abstract To permit ball-bonding of wires of aluminium or aluminium alloy to small electrical circuits or components, a spark discharge is created between the end of the wire and an electrode in a shielding atmosphere with a peak current density in the wire section which is from 40 to 450 times that used for ball-bonding gold wire. In this way oxidation of the ball is prevented.
Inventors
- 👤 Donald A. Edson
- 👤 Keith I. Johnson
- 👤 Michael H. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:28
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/002; B23K20/004; B23K20/005; B23K20/007; B23K20/14; H; H10; H10W; H10W72/00; H10W72/01; H10W72/015; H10W72/01551; H10W72/071; H10W72/0711; H10W72/07141; H10W72/07168; H10W72/075; H10W72/07502; H10W72/07511; H10W72/07531; H10W72/07532; H10W72/07533; H10W72/07541; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A method of forming a ball on a wire of aluminium or aluminium alloy by spark discharge to permit ball bonding of the wire to a component or terminal, comprising the step of forming the spark discharge by applying a voltage between 350v and 10,000v across a gap between an electrode and the wire in a shielding atmosphere, the circuit resistance being such that the peak current density in the wire section is from 1.2×10 9 A/m 2 to 13.5×10 9 A/m 2 .
Claim 2
Independent Claim
84 words
A method of forming a ball on a wire of aluminium or aluminium alloy by spark discharge to permit ball bonding of the wire to a component or terminal, comprising the step of forming the spark discharge by applying a voltage between 350v and 10,000v across a gap between an electrode and the wire in a shielding atmosphere, the circuit resistance being such that the peak current density in the wire section is from 1.2×10 9 A/m 2 to 13.5×10 9 A/m 2 .
References Cited (Backward Citations)
US2759088A
Cited
US2679570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |