US3564437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video signal amplifying circuit having d.c. restoration action
Assignee: Hitachi Ltd
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Filing: 1968-11-06
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Granted: 1971-02-16
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Expires: 1988-11-06
Abstract
Abstract AN AMPLIFYING CLAMP CIRCUIT COMPRISING: AN EMITTER GROUNDED NPN TRANSISTOR APPLIED WITH A BIAS VOLTAGE TO THE BASE THEREOF THROUGH A SERIES CIRCUIT OF FIRST AND SECOND RESISTORS, A CAPACITO CONNECTED TO THE JUNCTION BETWEEN SAID RESISTORS TO HOLD THE ELECTRIC POTENTIAL OF THE JUNCTION, A DIODE INSERTED BETWEEN THE COLLECTOR AND SAID JUNCTION TO ALLOW A CURRENT FLOW THERETHROUGH WHEN THE COLLECTOR POTENTIAL BECOMES LOWER THAN THAT OF SAID JUNCTION, THEREBY OBTAINING AN AMPLIFYING CLAMP CIRCUIT OPERATINGLY DERIVING FROM THE COLLECTOR AN OUTPUT SIGNAL WHICH IS REPRESENTATIVE OF AN AMPLIFIED INPUT SIGNAL APPLIED TO THE BASE AND IS CLAMPED AT THE MINIMUM LEVEL.
Inventors
- 👤 Takashi Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:58
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N5/18; H04N5/185; H03; H03K; H03K5/00; H03K5/01; H03K5/08; H03K5/082; H03K5/086
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |