Patent US3564455A successfully refreshed from Google Patents.
US3564455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable square-wave frequency generator using two operational amplifiers with feedback
Assignee: United States Department of the Navy
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Filing: 1969-07-24
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Granted: 1971-02-16
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Expires: 1989-07-24
Abstract
Abstract A SQUARE-WAVE FREQUENCY GENERATOR, FORMED OF A PAIR OF OPERATIONAL AMPLIFIERS DRIVEN AT SATURATION AND HAVING TWO INTERCONNECTED RESISTIVE FEEDBACK LOOPS, HAS A RESISTOR-CAPACITOR INTEGRATING NETWORK CONNECTED ACROSS ONE OF THE AMPLIFIERS TO CREATE A STABLE SQUARE-WAVE OUTPUT. STABILITY IS ENSURED BY EMPLOYING THE PASSIVE RESISTIVE ELEMENTS, ALONG WITH THE CAPACITOR, TO ESTABLISH THE TIME PERIOD OF A GENERATED WAVE AND, BY DRIVING THE AMPLIFIERS AT SATUATION, A SELF-SUSTAINING OUTPUT SIGNAL IS PROVIDED WHOSE PERIOD IS RELATIVELY INDEPENDENT OF POSSIBLE MINOR VARIATIONS IN THE INTERNAL SUPPLY POTENTIALS AND AMBIENT TEMPERATURES.
Inventors
- 👤 John O Wedel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:41
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/023; H03K3/0231
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 |