Patent US4905069A successfully refreshed from Google Patents.
US4905069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Darlington transistor arrangement
Assignee: Fuji Electric Co Ltd
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Filing: 1984-11-13
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Granted: 1990-02-27
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Expires: 2004-11-13
Abstract
Abstract In the particular embodiment described in the specification, a Darlington transistor arrangement has a stepped upper surface with an emitter terminal of the preceding transistor disposed at the bottom of a groove formed between spaced raised portions on which the collector terminal and the emitter terminal of the transistor are located. A base terminal is disposed at a lower surface formed on the outside of the raised portion where either the collector terminal or the emitter terminal is situated, thereby providing sufficient insulation distance between terminals and avoiding the problem resulting from a crossing between the power wiring to the load or power source and the base driving wiring.
Inventors
- 👤 Hisao Shigekane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:51
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/10; H10W74/111; H10W90/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A Darlington transistor including a resin housing body having a stepped surface comprising alternating upper and lower planar portions; a collector terminal and an emitter terminal formed on respective upper portions of the stepped surface; a base terminal and an emitter-base terminal formed on respective lower portions of the stepped surface, wherein the lower portion of the stepped surface on which the base terminal is formed is situated between an edge of the stepped surface and the upper portions thereof on which the collector and emitter terminals are respectively formed and the lower portion of the stepped surface on which the emitter-base terminal is formed is situated between the upper portions of the stepped surface on which the collector and emitter terminals are respectively formed.
Claim 2
Dependent Claim
125 words
A Darlington transistor including a resin housing body having a stepped surface comprising alternating upper and lower planar portions; a collector terminal and an emitter terminal formed on respective upper portions of the stepped surface; a base terminal and an emitter-base terminal formed on respective lower portions of the stepped surface, wherein the lower portion of the stepped surface on which the base terminal is formed is situated between an edge of the stepped surface and the upper portions thereof on which the collector and emitter terminals are respectively formed and the lower portion of the stepped surface on which the emitter-base terminal is formed is situated between the upper portions of the stepped surface on which the collector and emitter terminals are respectively formed.
References Cited (Backward Citations)
US4106052A
Cited
US4518982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |