US3711341A
Expired / Lapsed
US
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Method of making sintered metal ultrasonic bonding tips
Assignee: International Business Machines Corp
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Filing: 1970-05-04
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Granted: 1973-01-16
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Expires: 1990-05-04
Abstract
Abstract An ultrasonic bonding tip fabricated of sintered metal, preferably stainless steel. The tips are particularly useful in the bonding of wire and ultrafine wires to other conductive metal surfaces. The general method consists of compacting stainless steel powders and heating the compact in air at 1000* F for 20 minutes. The compact is then sintered in dissociated ammonia at 2000*-2350* F for one hour. The bodies are repressed and heated at 1500*-2000* F in an endo-thermal atmosphere followed by air cooling. The tips are then tempered and ground to final size. Optionally, they may be finally dipped in acid baths.
Inventors
- 👤 K Joshi
- 👤 F Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:46
CPC Classifications
B; B22; B22F; B22F5/00; B23; B23K; B23K20/00; B23K20/10; B23K20/106; B23K2101/00; B23K2101/32; H; H10; H10W; H10W72/00; H10W72/071; H10W72/0711; H10W72/07141
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
A process for fabricating ultrasonic bonding tips as defined in claim 1 further including the steps of dipping in a 10 - 15 percent sulfuric acid solution at 130* F to l70* F for a period of two to 5 minutes followed by an immersion in a nitric (8 12 percent) hydrofluoric (0.5 to 1.5 percent) acid solution at a range of 125* F to 150* F for approximately 1 minute which is followed by a thorough water rinse.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |