US3609460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transistor having ballasted emitter fingers interdigitated with base fingers
Assignee: RCA Corp
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Filing: 1968-06-28
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Granted: 1971-09-28
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Expires: 1988-06-28
Abstract
Abstract A transistor with interdigitated emitter and base fingers in which the emitter has a web portion for feeding current to the fingers, metal layers on both web and fingers, the finger portion metal layers being spaced from the web portion metal layer to introduce ballasting resistance, and the ends of the base fingers being spaced from the web metallizing a considerably greater distance than the spacing between emitter finger metallizing and the emitter-base junction.
Inventors
- 👤 Joel Ollendorf
- 👤 Frederick P Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:25
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/101; H10D84/121
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
A transistor according to claim 1 in which the configuration is P-N-P.
Claim 2
Dependent Claim
18 words
A transistor according to claim 1 in which said emitter fingers and base fingers are rectangular in shape.
Claim 3
Dependent Claim
21 words
A transistor according to claim 1 in which said base region comprises a web portion and finger portions extending perpendicularly thereto.
Claim 4
Dependent Claim
201 words
A transistor of the type including emitter, base and collector regions of alternate conductivity types and having P-N junctions between emitter and base regions and between base and collector regions, wherein a. said emitter region comprises a central web portion and finger portions extending outwardly from the web portion, b. a metal contact layer covering part of said emitter web portion, c. a metal contact layer covering part of each of said emitter finger portion but separated from said emitter web contact layer a predetermined distance whereby a first series resistance of predetermined amount is provided in each said emitter finger portion, d. said metal contact layer on each said emitter finger portion also being spaced from said emitter-base junction, thus providing a second resistance in each said emitter finger portion, e. said base region including base finger portions interdigitated with said emitter finger portions and having extremities separated by a certain distance from said metal contact layer on said emitter web portion, f. the distance between the emitter web portion metal layer and the closest portion of the emitter-base junction being about 8 times the distance between the emitter web portion metal layer and an emitter finger portion metal layer.
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 |