US3736367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead frames and method of making same
Assignee: TE Connectivity Corp
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Filing: 1971-04-09
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Granted: 1973-05-29
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Expires: 1991-04-09
Abstract
Abstract The disclosure relates to a lead frame having a plate-like heat sink portion and three leads, one of which is integral with the heat sink, are manufactured by blanking heat sink and leads, bending the integral lead relative to the heat sink, forming ends of the remaining leads, and again bending integral leads so that leads are in a plane which is parallel to, and spaced from the heat sink.
Inventors
- 👤 F Heinlen
- 👤 R Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:31
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/421; H10W70/424; H10W70/427; H10W70/481; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49121
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
283 words
A stamped and formed transistor lead frame comprising: a mounting plate portion having a mounting surface upon which a transistor is adapted to be mounted, said surface defining a first plane, first, second, and third leads, said leads having free ends which are spaced from said mounting plate portions, said leads having intermediate portions which extend parallel to each other and towards said mounting plate portion, said leads being in a second plane which is parallel to, and spaced from, said first plane, said leads having inner ends which are proximate to said mounting plate portion, said first lead being between said second and third leads, a first lead transition section which is integral with said mounting plate portion and said inner end of said first lead, said first lead transition section extending between said first and second planes, a second lead transition section integral with said inner end of said second lead, said second lead transition section comprising a first arm extending from said inner end of said second lead laterally towards said first lead, a third arm extending generally parallel to said leads and over said mounting plate section, and second arm means extending between said first and third arms, said second arm defining planes which extend normally of said first and second planes, a third lead transition section extending from said inner end of said third lead, said third lead transition section being a substantial mirror image of said second lead transition section, and second and third lead contact arms extending from said third arms of said second and third lead transition sections, said contact arms being adapted to be bonded to a transistor supported as said mounting plate section.
Claim 2
Dependent Claim
283 words
A stamped and formed transistor lead frame comprising: a mounting plate portion having a mounting surface upon which a transistor is adapted to be mounted, said surface defining a first plane, first, second, and third leads, said leads having free ends which are spaced from said mounting plate portions, said leads having intermediate portions which extend parallel to each other and towards said mounting plate portion, said leads being in a second plane which is parallel to, and spaced from, said first plane, said leads having inner ends which are proximate to said mounting plate portion, said first lead being between said second and third leads, a first lead transition section which is integral with said mounting plate portion and said inner end of said first lead, said first lead transition section extending between said first and second planes, a second lead transition section integral with said inner end of said second lead, said second lead transition section comprising a first arm extending from said inner end of said second lead laterally towards said first lead, a third arm extending generally parallel to said leads and over said mounting plate section, and second arm means extending between said first and third arms, said second arm defining planes which extend normally of said first and second planes, a third lead transition section extending from said inner end of said third lead, said third lead transition section being a substantial mirror image of said second lead transition section, and second and third lead contact arms extending from said third arms of said second and third lead transition sections, said contact arms being adapted to be bonded to a transistor supported as said mounting plate section.
Claim 3
Dependent Claim
35 words
A lead frame as set forth in claim 1 wherein said third arm means of said second and third lead transition sections lie in planes which extend substantially normally of said first and second planes.
Claim 4
Dependent Claim
26 words
A lead frame as set forth in claim 1, said third arms of said second and third lead transition sections lying substantially in said second plane.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |