Patent US3553541A successfully refreshed from Google Patents.
US3553541A
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Bilateral switch using combination of field effect transistors and bipolar transistors
Assignee: AT&T Inc
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Filing: 1969-04-17
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Granted: 1971-01-05
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Expires: 1989-04-17
Abstract
Abstract THE FUNCTIONS OF A PLURALITY OF INSULATED GATE FIELD EFFECT TRANSISTORS AND BIPOLAR TRANSISTORS ARE COMBINED IN A COMPOUND DEVICE WHICH IS ELECTRICALLY SYMMETRICAL (BILATERAL) AND WHICH HAS VERY HIGH INPUT IMPEDANCE, LOW OUTPUT IMPEDANCE, AND HIGH CURRENT GAIN. THE DEVICE IS ADVANTAGEOUSLY EMPLOYED AS A BILATERAL COUPLING ELEMENT IN DIGITAL INTEGRATED CIRCUITS, E.G., SEMICONDUCTOR MEMORIES, DC SHIFT REGISTERS, AND DYAMIC SHIFT REGISTERS.
Inventors
- 👤 Ernam F King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:17
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/41; G11C11/412; H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/6871; H03K17/6874; H03K19/00; H03K19/0175; H03K19/017509; H03K19/017518; H03K19/02; H03K19/08; H03K19/094; H03K19/0944; H03K19/09448; H03K3/00; H03K3/02; H03K3/353; H03K3/356; H03K3/356017; H03K3/356052; H03K3/35606; H10; H10D; H10D84/00; H10D84/40; H10D84/401; H10D84/403; H10D84/406
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |