US4889274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas mixture for use in control and formation of ball bonds
Assignee: Texas Instruments Inc
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Filing: 1988-03-22
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Granted: 1989-12-26
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Expires: 2008-03-22
Abstract
Abstract The disclosure relates to the use of metastable state of mixed gases which, when appropriately mixed, provide better control of current and voltage conditions and subsequent arc formation properties in making balls of aluminum, copper and gold with an electronic flame-off method. The specific mixtures involve inert argon mixed with small amounts of hydrogen and neon. Exceptionally well controlled balls of uniform size result.
Inventors
- 👤 Thomas H. Ramsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:47
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/38; B23K35/383; H; H10; H10W; H10W72/00; H10W72/01; H10W72/015; H10W72/01551; H10W72/071; H10W72/0711; H10W72/07125; H10W72/07141; H10W72/075; H10W72/07511; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W72/5525
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
66 words
A method of bonding a wire to a semiconductor bonding pad, comprising the steps of: (a) providing a wire taken from the class consisting of aluminum, copper and gold, (b) providing an atmosphere surrounding said wire comprising from about 0.5 to about 10% neon, from about 10 to about 0.5% hydrogen, and the remainder essentially argon, and (c) forming an electric arc extending to said wire.
Claim 2
Independent Claim
66 words
A method of bonding a wire to a semiconductor bonding pad, comprising the steps of: (a) providing a wire taken from the class consisting of aluminum, copper and gold, (b) providing an atmosphere surrounding said wire comprising from about 0.5 to about 10% neon, from about 10 to about 0.5% hydrogen, and the remainder essentially argon, and (c) forming an electric arc extending to said wire.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said neon is about 4% and said hydrogen is about 1%.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |