Patent US4767049A successfully refreshed from Google Patents.
US4767049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Special surfaces for wire bonding
Assignee: Olin Corp
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Filing: 1986-05-19
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Granted: 1988-08-30
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Expires: 2006-05-19
Abstract
Abstract The present invention relates to a process for forming improved bonds between components of electrical or electronic devices. The process of the present invention preferably comprises annealing a metallic substrate to form a substantially uniform, substantially continuous oxide layer on a surface of the substrate, exposing the oxidized substrate to a reducing atmosphere so as to form an irregular surface on the substrate, and bonding another component to the irregular surface.
Inventors
- 👤 Sheldon H. Butt
- 👤 Julius C. Fister
- 👤 Jacob Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:43
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/01; H10W70/04; B; B23; B23K; B23K20/00; B23K20/24; B23K26/00; B23K26/36; B23K26/361; H10W70/40; H10W70/421; H10W70/424; H10W70/456; H10W70/458; B23K2101/00; B23K2101/36; B23K2101/40; B23K7/00; B23K7/06; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W72/5525; H10W72/851; H10W72/874; H10W72/884; H10W90/00; H10W90/701; H10W90/731; H10W90/734; H10W90/751; H10W90/756; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12472; Y10T428/12993
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
A process for forming an improved electrical connection comprising: forming in situ a roughened substantially nondirectional surface having an irregular topography on a first copper base metal or metal alloy component by means of forming a metal oxide layer having a desired thickness on a surface of said first component by annealing said first component in an oxidizing atmosphere at a temperature in the range of from about 200° C. to about 500° C. for a time period in the range of from about 0.5 minutes to about 1000 hours; and reducing said metal oxide layer to a relatively fresh metal layer having said irregular topography by heating said first component with said oxide layer in a reducing atmosphere at a temperature in the range of from about 200° C. to about 500° C. for a time period in the range of from about 0.5 minutes to about 1000 hours; and bonding a second metallic component to said surface of said first component, whereby the non-directionality and the irregular topography of said surface promotes development of an improved metallurgical bond between said components.
Claim 2
Dependent Claim
183 words
A process for forming an improved electrical connection comprising: forming in situ a roughened substantially nondirectional surface having an irregular topography on a first copper base metal or metal alloy component by means of forming a metal oxide layer having a desired thickness on a surface of said first component by annealing said first component in an oxidizing atmosphere at a temperature in the range of from about 200° C. to about 500° C. for a time period in the range of from about 0.5 minutes to about 1000 hours; and reducing said metal oxide layer to a relatively fresh metal layer having said irregular topography by heating said first component with said oxide layer in a reducing atmosphere at a temperature in the range of from about 200° C. to about 500° C. for a time period in the range of from about 0.5 minutes to about 1000 hours; and bonding a second metallic component to said surface of said first component, whereby the non-directionality and the irregular topography of said surface promotes development of an improved metallurgical bond between said components.
Claim 3
Dependent Claim
39 words
The process of claim 1 further comprising: said temperature being in the range of from about 300° C. to about 400° C.; and said time period being in the range of from about 10 minutes to about 200 hours.
Claim 4
Dependent Claim
23 words
The process of claim 1 further comprising: cleaning said roughened surface using a laser beam to remove organics prior to said bonding step.
Claim 5
Dependent Claim
36 words
The process of claim 1 further comprising: said temperature being in the range from about 300° C. to about 400° C.; and said time period being in the range from about 10 minutes to 200 hours.
Claim 6
Dependent Claim
72 words
A process for forming an improved electrical interconnection comprising: forming a roughened surface having an irregular topography on a first metallic component; cleaning said surface; said cleaning step comprising using a laser beam to remove organics from said roughened surface; and bonding a second metallic component to said cleaned roughened surface on said first component, whereby the irregular topography of said roughened surface promotes development of an improved bond between said components.
Claim 7
Dependent Claim
72 words
A process for forming an improved electrical interconnection comprising: forming a roughened surface having an irregular topography on a first metallic component; cleaning said surface; said cleaning step comprising using a laser beam to remove organics from said roughened surface; and bonding a second metallic component to said cleaned roughened surface on said first component, whereby the irregular topography of said roughened surface promotes development of an improved bond between said components.
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |