US3717775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling of bistable elements by conductivity modulation
Assignee: US Philips Corp
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Filing: 1971-05-06
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Granted: 1973-02-20
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Expires: 1991-05-06
Abstract
Abstract DEVICE DRAINS OFF ACCUMULATED MINORITY CARRIERS IN A TURNED-ON PRECEDING BISTABLE ELEMENT. ADVANTAGES INCLUDE FASTER SPEED AND SIMPLER CONSTRUCTION. A SEMICONDUCTOR SHIFT REGISTER, MEMORY OR RING COUNTER IS DESCRIBED USING BISTABLE ELEMENTS, SUCH AS THYRISTORS OR UNIJUNCTION TRANSISTORS, COUPLED BY MEANS OF CONDUCTIVITY MODULATION DEVICES, SUCH AS A UNIJUNCTION TYPE OF TRANSISTOR, WITH THE COUPLING SUCH THAT THE CURRENT WHICH CAUSES CONDUCTIVITY MODULATION OF THE COUPLING
Inventors
- 👤 W Kasperkovitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:28
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/33; H10; H10D; H10D99/00; H10W; H10W20/00; H10W20/40
Claims Analysis
Total Claims: 0
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |