US5618576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead frame manufacturing method
Assignee: Hanwha Aerospace Co Ltd
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Filing: 1996-04-04
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Granted: 1997-04-08
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Expires: 2016-04-04
Abstract
Abstract A method for making a lead frame comprising overflow plating the lead frame to form a plating layer thereon; and heating the plated lead frame at a predetermined temperature to rearrange the plating layer. Therefore, the rearrangement of the overflow-plated lead frame, by thermal treatment, effectively eliminates the number of pores formed in the plating layer of the lead frame, thereby greatly reducing the number of corrosive portions.
Inventors
- 👤 Young-ho Baek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:57
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/01; H10W70/04; C; C25; C25D; C25D5/00; C25D5/48; C25D5/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
57 words
A method for making a lead frame, comprising the steps of: forming a metal plate made of an alloy, into a lead frame shape; plating nickel onto said metal plate; plating palladium or a palladium alloy onto said nickel-plated metal plate; and heating said palladium plated metal plate at a temperature of 450°-800° C. for 30-160 seconds.
Claim 2
Independent Claim
57 words
A method for making a lead frame, comprising the steps of: forming a metal plate made of an alloy, into a lead frame shape; plating nickel onto said metal plate; plating palladium or a palladium alloy onto said nickel-plated metal plate; and heating said palladium plated metal plate at a temperature of 450°-800° C. for 30-160 seconds.
Claim 3
Dependent Claim
36 words
The method for making a lead frame of claim 1, wherein said heating step is performed under a gas atmosphere containing at least one gas selected from the group consisting of nitrogen, hydrogen, argon and helium.
Claim 4
Dependent Claim
22 words
The method for making a lead frame of claim 1, wherein said nickel is plated to a thickness of about 1.5 μm.
Claim 5
Dependent Claim
25 words
The method for making a lead frame of claim 1, wherein said palladium or palladium alloy is plated to a thickness of about 0.2 μm.
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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) | 2000-04-07 | 2000-10-07 | 2001-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-07 | 2004-10-07 | 2005-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-07 | 2008-10-07 | 2009-04-08 | $7700.00 | Window Closed / Lapsed |