US3622385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of providing flip-chip devices with solderable connections
Assignee: Raytheon Co
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Filing: 1968-07-19
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Granted: 1971-11-23
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Expires: 1988-07-19
Abstract
Abstract Method of providing flip-chip devices having aluminum connection means with solderable connections by applying ''''fresh'''' aluminum on the existing aluminum means and then in the same vacuum depositing nickel or nickel-chrome on the ''''fresh'''' aluminum and a solderable metal (copper or gold) onto the nickel (or nickelchrome).
Inventors
- 👤 Fritz W Stork
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:41
CPC Classifications
H; H10; H10W; H10W20/00; H10W20/40; H10W72/00; H10W72/071; H10W72/0711; H10W72/072; H10W72/07231; H10W72/07236
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
The method of providing an electronic device having an aluminum connection means thereon with a solderable connection means comprising the steps of: a. placing in a vacuum, an electronic device having an aluminum connection means thereon, wherein the surface of the aluminum has acquired a surface layer of aluminum oxide; b. in vacuum, coating said aluminum connection means with a new layer of aluminum; c. while maintaining said vacuum, coating said new layer of aluminum with a layer of metal selected from the group consisting of nickel and nickel-chrome alloy; d. and, while still maintaining said vacuum, coating said last-named layer of metal with successive layers of copper and gold in the order named.
Claim 2
Dependent Claim
22 words
The invention according to claim 2 wherein the layer of gold is thin relative to the thickness of the layer of copper.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |