US4549043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic conductor and a method of manufacturing it
Assignee: Shell USA Inc
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Filing: 1984-01-04
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Granted: 1985-10-22
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Expires: 2004-01-04
Abstract
Abstract An electronic conductor and a method for manufacturing it are provided. The conductor is made of a base of substantially copper having a diffusion barrier on the base and a coating of tin-lead, or of tin, on the diffusion barrier. The diffusion barrier is either copper in combination with phosphorus, or copper in combination with boron. The method of manufacturing an electronic conductor applies the diffusion barrier to the base by means of an electro-deposition process and then applies the coating on the diffusion barrier.
Inventors
- 👤 Prematilaka W. Kalubowila
- 👤 Stanislaw P. Wach
- 👤 Michael B. Levens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:24
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/244; C; C23; C23C; C23C28/00; C23C28/02; C25; C25D; C25D5/00; C25D5/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12687; Y10T428/12694
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
An electronic circuit board conductor comprising: a base made substantially of copper; a diffusion barrier comprising copper in combination with phosphorus or with boron disposed on said base; and a coating of substantially tin disposed on said diffusion barrier.
Claim 2
Dependent Claim
39 words
An electronic circuit board conductor comprising: a base made substantially of copper; a diffusion barrier comprising copper in combination with phosphorus or with boron disposed on said base; and a coating of substantially tin disposed on said diffusion barrier.
Claim 3
Dependent Claim
14 words
An electronic conductor as claimed in claim 1, wherein said base is a strip.
Claim 4
Dependent Claim
30 words
An electronic conductor as claimed in claim 1, wherein the thickness of the coating of substantially tin is in the range of from about 0.25 μm to about 25 μm.
Claim 5
Independent Claim
43 words
A method of manufacturing an electronic conductor, comprising: applying copper in combination with phosphorus to a base made substantially of copper by an electro-deposition process to form a diffusion barrier thereon, and then applying a coating of substantially tin on said diffusion barrier.
Claim 6
Independent Claim
43 words
A method of manufacturing an electronic conductor, comprising: applying copper in combination with phosphorus to a base made substantially of copper by an electro-deposition process to form a diffusion barrier thereon, and then applying a coating of substantially tin on said diffusion barrier.
Claim 7
Dependent Claim
16 words
The method as claimed in claim 4, wherein the coating is applied by an electro-deposition process.
Claim 8
Dependent Claim
23 words
The method as claimed in claim 4, wherein the coating is applied by dipping the base into a molten material comprising substantially tin.
Claim 9
Independent Claim
43 words
A method of manufacturing an electronic conductor comprising: applying copper in combination with boron to a base made substantially of copper by an electro-deposition process to form a diffusion barrier thereon, and then applying a coating of substantially tin on said diffusion barrier.
Claim 10
Independent Claim
43 words
A method of manufacturing an electronic conductor comprising: applying copper in combination with boron to a base made substantially of copper by an electro-deposition process to form a diffusion barrier thereon, and then applying a coating of substantially tin on said diffusion barrier.
Claim 11
Dependent Claim
16 words
The method as claimed in claim 7, wherein the coating is applied by an electro-deposition process.
Claim 12
Dependent Claim
23 words
The method as claimed in claim 7, wherein the coating is applied by dipping the base into a molten material comprising substantially tin.
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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |