US3560878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant frequency amplitude-to-pulse width converter
Assignee: AT&T Inc
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Filing: 1968-06-27
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Granted: 1971-02-02
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Expires: 1988-06-27
Abstract
Abstract A PAIR OF CAPACITORS ARE CAUSED TO ALTERNATEELY CHARGE AT A CONSTANT RATE THROUGH THE BASE-EMITTER PATHS OF A PAIR OF TRANSISTORS UNTIL THEIR VOLTAGES REACH FIRST AND SECOND VARIABLE THRESHOLD VOLTAGES, RESPECTIVELY. AT THE INSTANT EACH CAPACITOR REACHES ITS THRESHOLD VOLTAGE, IT IS ABRUPTLY DISCHARGED AND THE OTHER CAPACITOR STARTS TO CHARGE. RECTANGULAR VOLTAGE WAVEFORMS OF OPPOSITE PHASE APPEAR ACROSS RESISTORS IN THE COLLECTOR CIRCUITS OF THE TRANSISTORS. THE WIDTHS OF THE PULSES IN THE WAVEFORMS ARE CONTROLLED BY THE THRESHOLD VOLTAGES. BY MAINTAINING THE SUM OF THE THRESHOLD VOLTAGES CONSTANT, THE FREQUENCY OF THE WAVEFORMS WILL BE CONSTANT REGARDLESS OF PULSE WIDTH.
Inventors
- 👤 Noble E Wickliff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:43
CPC Classifications
H; H03; H03K; H03K7/00; H03K7/08
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |