US3609474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor with improved heat dissipation characteristics
Assignee: Texas Instruments Inc
•
Filing: 1969-11-10
•
Granted: 1971-09-28
•
Expires: 1989-11-10
Abstract
Abstract Disclosed is a semiconductor device, such as a transistor, including an extended emitter contact with one portion thereof having a small dimension for contact to the emitter region of the device, and another relatively large heat dissipation portion overlying the base region of the transistor for heat sinking purposes. The emitter contact is separated from the base contact by a relatively thick layer of insulation which avoids degrading the electrical parameters of the device.
Inventors
- 👤 Britton T Vincent Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:17
CPC Classifications
H; H10; H10W; H10W20/00; H10W20/40; H10D; H10D99/00; H10W40/00; H10W40/10; Y; Y10; Y10S; Y10S148/00; Y10S148/02; Y10S148/085
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
The semiconductor device of claim 1 wherein: a. said substrate includes an epitaxial layer of semiconductor material of said one conductivity type and a support layer of semiconductor material of said opposite conductivity type; and wherein b. said first and second regions are formed in said epitaxial layer.
Claim 2
Dependent Claim
38 words
The semiconductor device of claim 2 wherein: a. said device is a transistor including collector, base, base contact, and emitter regions; and wherein b. said support layer and said epitaxial layers are respectively said collector and base regions.
Claim 3
Dependent Claim
51 words
The semiconductor device of claim 3 wherein: a. said second plurality of conductors extend outwardly beyond one edge of the overlying layer of conductive material, corrugated conductor and islands of dielectric material; and wherein b. said extended second conductors are ohmically connected to respective prongs of a multiprong extended base contact.
Claim 4
Dependent Claim
36 words
The semiconductor device of claim 4 wherein: a. said corrugated conductor extends outwardly in a direction opposite to said extended base contact; and wherein b. said corrugated conductor is ohmically connected to an extended emitter contact.
Claim 5
Dependent Claim
26 words
The semiconductor device of claim 5 and further including a collector contact ohmically connected to said support layers through a window formed in said epitaxial layer.
Claim 6
Dependent Claim
19 words
The semiconductor device of claim 1 wherein said insulating layer and said islands of dielectric material are silicon oxide.
Claim 7
Dependent Claim
33 words
The semiconductor device of claim 1 wherein said first and second metallic conductors are dual layers of metal composed of a bottom layer of molybdenum or chromium and a top layer of gold.
Claim 8
Dependent Claim
39 words
The semiconductor device of claim 1 wherein said first and second metallic conductors are multilayers of metal composed of a bottom layer of molybdenum or chromium, a middle layer of gold and an outer layer of molybdenum or chromium.
Claim 9
Dependent Claim
59 words
The semiconductor device of claim 1 wherein: a. said corrugated metallic conductor is composed of a bottom layer of molybdenum and a top layer of gold; and wherein b. the lower areas of said bottom layer ohmically contact said emitter regions, and said top layer of the outer areas and upper hollows ohmically contacts said layer of conductive material.
Claim 10
Dependent Claim
53 words
The semiconductor device of claim 1 wherein: a. said layer of conductive material is composed of a relatively thick bottom layer of copper and a relatively thin top layer of gold; and wherein b. said bottom layer of copper is ohmically contacting the outer areas and upper hollows of said corrugated metallic conductor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |