Patent US3439237A successfully refreshed from Google Patents.
US3439237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analogue unijunction device
Assignee: General Electric Co
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Filing: 1966-10-31
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Granted: 1969-04-15
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Expires: 1986-10-31
Abstract
No abstract record available.
Inventors
- 👤 Tage P Sylvan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:03
CPC Classifications
H; H10; H10D; H10D18/00; H10D18/251; H10D84/00; H10D84/60; H10D99/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
AN ANALOGUE UNIJUNCTION TRANSISTOR COMPRISING, (A) A FOUR LAYER SEMICONDUCTOR DEVICE, ADJACENT LAYERS BEING DOPED WITH OPPOSITE TYPE IMPURITIES, (B) AN EMITTER ELECTRODE CONNECTED TO A FIRST END LAYER OF SAID FOUR LAYER DEVICE, (C) A FIRST RESISTANCE, THE ENDS OF WHICH ARE RESPECTIVELY CONNECTED TO TWO LAYERS OF SAID FOUR LAYER DEVICE, SAID TWO LAYERS BEING OF AN IMPURITY TYPE OPPOSITE THAT OF SAID FIRST END LAYER, (D) A SECOND RESISTANCE, ONE END OF WHICH IS CONNECTED TO THE COMMON POINT TO WHICH SAID FIRST RESISTANCE IS THE INTERNAL LAYER TO WHICH SAID FIRST RESISTANCE IS CONNECTED, (E) A BASE ONE ELECTRODE CONNECTED TO ONE END OF SAID FIRST RESISTANCE OPPOSITE FROM SAID COMMON POINT, AND (F) A BASE TWO ELECTRODE CONNECTED TO THE END OF SAID SECOND RESISTANCE OPPOSITE FROM SAID COMMON POINT.
Claim 2
Dependent Claim
135 words
AN ANALOGUE UNIJUNCTION TRANSISTOR COMPRISING, (A) A FOUR LAYER SEMICONDUCTOR DEVICE, ADJACENT LAYERS BEING DOPED WITH OPPOSITE TYPE IMPURITIES, (B) AN EMITTER ELECTRODE CONNECTED TO A FIRST END LAYER OF SAID FOUR LAYER DEVICE, (C) A FIRST RESISTANCE, THE ENDS OF WHICH ARE RESPECTIVELY CONNECTED TO TWO LAYERS OF SAID FOUR LAYER DEVICE, SAID TWO LAYERS BEING OF AN IMPURITY TYPE OPPOSITE THAT OF SAID FIRST END LAYER, (D) A SECOND RESISTANCE, ONE END OF WHICH IS CONNECTED TO THE COMMON POINT TO WHICH SAID FIRST RESISTANCE IS THE INTERNAL LAYER TO WHICH SAID FIRST RESISTANCE IS CONNECTED, (E) A BASE ONE ELECTRODE CONNECTED TO ONE END OF SAID FIRST RESISTANCE OPPOSITE FROM SAID COMMON POINT, AND (F) A BASE TWO ELECTRODE CONNECTED TO THE END OF SAID SECOND RESISTANCE OPPOSITE FROM SAID COMMON POINT.
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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |