US5230144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing lead frame
Assignee: Seiko Epson Corp
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Filing: 1992-03-16
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Granted: 1993-07-27
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Expires: 2012-03-16
Abstract
Abstract A lead frame having inner leads which secures predetermined mechanical strength and which has no possibility of generation of twisting or the like through working, and a method of producing such a lead frame.
Inventors
- 👤 Tetsuya Ootsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:16
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/411; H10W70/01; H10W70/04; H10W70/048; H10W70/042; H10W70/421; H10W70/424; H10W72/00; H10W72/50; H10W72/541; H10W72/5445; H10W72/90; H10W72/931; H10W72/932; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49121
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
A method of forming a lead in a lead frame plate having first and second opposed surfaces comprising etching a pair of spaced apart first grooves each having a first depth in said first surface, said first grooves each having, at said first surface, a first width, etching a pair of spaced apart second grooves each having a depth less than said first depth in the second surface of said plate and in alignment with a respective first groove, said second grooves each having, at said second surface, a second width less than said first width, each said second groove having a bottom surface separated from a bottom surface of its respective first groove by a reduced thickness portion of said plate, and thereafter punching away said reduced thickness portion for interconnecting said respective first and second grooves and thereby forming a lead between said interconnected grooves, said lead having an axis of elongation, and the width of said lead at said first surface in a plane perpendicular to said axis being less than the width thereof at said second surface in said plane.
Claim 2
Independent Claim
184 words
A method of forming a lead in a lead frame plate having first and second opposed surfaces comprising etching a pair of spaced apart first grooves each having a first depth in said first surface, said first grooves each having, at said first surface, a first width, etching a pair of spaced apart second grooves each having a depth less than said first depth in the second surface of said plate and in alignment with a respective first groove, said second grooves each having, at said second surface, a second width less than said first width, each said second groove having a bottom surface separated from a bottom surface of its respective first groove by a reduced thickness portion of said plate, and thereafter punching away said reduced thickness portion for interconnecting said respective first and second grooves and thereby forming a lead between said interconnected grooves, said lead having an axis of elongation, and the width of said lead at said first surface in a plane perpendicular to said axis being less than the width thereof at said second surface in said plane.
References Cited (Backward Citations)
JPS5683959A
Cited
JPS5987845A
Cited
JPS63128739A
Cited
JPH02209355A
Cited
JPH02244663A
Cited
JPH02284453A
Cited
JPH036048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-26 | 1997-01-25 | 1997-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-26 | 2001-01-25 | 2001-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-26 | 2005-01-25 | 2005-07-27 | $7700.00 | Window Closed / Lapsed |