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US5352633A
Expired / Lapsed
US
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Semiconductor lead frame lead stabilization
Assignee: Texas Instruments Inc
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Filing: 1992-06-02
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Granted: 1994-10-04
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Expires: 2012-06-02
Abstract
Abstract The invention is to an apparatus and method for applying a plastic material to a lead frame for stabilizing the leads and retaining them in a common plane.
Inventors
- 👤 Donald C. Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:33
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/421; H10W70/435; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/341; H05K3/3421; H05K3/3426; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1744; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49121
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
A method for stabilizing multiple leads on a lead frame, including a mounting pad and lead fingers, comprising the steps of: aligning selected portions of the lead fingers, spaced from the mounting pad, with a plastic preform; and applying heat and pressure to the lead frame and plastic preform to melt the plastic causing it to flow around the selected portions of the lead frame leads, securing them in fixed relationship with each other.
Claim 2
Independent Claim
74 words
A method for stabilizing multiple leads on a lead frame, including a mounting pad and lead fingers, comprising the steps of: aligning selected portions of the lead fingers, spaced from the mounting pad, with a plastic preform; and applying heat and pressure to the lead frame and plastic preform to melt the plastic causing it to flow around the selected portions of the lead frame leads, securing them in fixed relationship with each other.
Claim 3
Dependent Claim
20 words
The method according to claim 1, wherein the plastic preform is shaped to under lie only the lead frame leads.
Claim 4
Dependent Claim
31 words
The method according to claim 1, wherein said plastic preform is on a carrier base which is peeled away after heat has been applied the plastic has solidified around the leads.
Claim 5
Dependent Claim
32 words
The method according to claim 1, wherein said preform is on a carrier base with index holes for indexing preforms under lead frames, and for aligning the preform with the lead frame.
Claim 6
Dependent Claim
40 words
The method according to claim 4, including the step of aligning the lead frame and preform on a support base utilizing index pins on the support base and index holes in the lead frame and in a preform backing material.
Claim 7
Independent Claim
81 words
A method for stabilizing multiple leads on a lead frame, including a mounting pad and lead fingers, comprising the steps of: aligning selected intermediate portions of the lead fingers, spaced from the mounting pad, with a plastic preform mounted on a carrier base; applying heat and pressure to the lead frame and plastic preform to melt the plastic causing it to flow around the lead frame leads securing them in fixed relationship with each other; and removing the preform carrier base.
Claim 8
Independent Claim
81 words
A method for stabilizing multiple leads on a lead frame, including a mounting pad and lead fingers, comprising the steps of: aligning selected intermediate portions of the lead fingers, spaced from the mounting pad, with a plastic preform mounted on a carrier base; applying heat and pressure to the lead frame and plastic preform to melt the plastic causing it to flow around the lead frame leads securing them in fixed relationship with each other; and removing the preform carrier base.
Claim 9
Dependent Claim
20 words
The method according to claim 6, wherein the plastic preform is shaped to under lie only the lead frame leads.
Claim 10
Dependent Claim
26 words
The method according to claim 6, wherein said plastic preform is peeled away after heat has been applied and the plastic has solidified around the leads.
Claim 11
Dependent Claim
28 words
The method according to claim 6, wherein said carrier base has index holes for indexing preforms under lead frames, and for aligning the preform with the lead frame.
Claim 12
Dependent Claim
40 words
The method according to claim 9, including the step of aligning the lead frame and preform on a support base utilizing index pins on the support base and index holes in the lead frame and in a preform backing material.
References Cited (Backward Citations)
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US4837184A
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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) | 1997-10-03 | 1998-04-04 | 1998-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-03 | 2002-04-04 | 2002-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-03 | 2006-04-04 | 2006-10-04 | $7700.00 | Window Closed / Lapsed |