Patent US2401858A successfully refreshed from Google Patents.
US3136990A
Expired / Lapsed
US
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Voltage to frequency converter
Assignee: Individual
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Filing: 1962-10-29
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Granted: 1964-06-09
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Expires: 1982-10-29
Abstract
No abstract record available.
Inventors
- 👤 James M Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:50
CPC Classifications
H; H03; H03K; H03K25/00; H03K7/00; H03K7/06; H03M; H03M1/00; H03M1/12; H03M1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN COMBINATION IN AN ANALOG TO DIGITAL CONVERTER, AN INTEGRATING CONDENSER, A CHARGING CIRCUIT COMPRISING THE CONTROLLED PATH OF A TRANSISTOR AND A FIXED BIAS SOURCE CONNECTED ACROSS SAID CONDENSER, THE CONTROLLING CIRCUIT OF SAID TRANSISTOR BEING CONNECTED TO THE ANALOG VOLTAGE SOURCE TO BE CONVERTED, A DISCHARGING CIRCUIT COMPRISING A SWITCHING DIODE CONNECTED ACROSS SAID CONDENSER, MEANS FOR NORMALLY REVERSELY BIASING SAID DIODE TO OFF CONDITIONS DURING THE CHARGING OF SAID CONDENSER, MEANS FOR SELECTIVELY FORWARDLY BIASING SAID DIODE TO ON CONDITION TO DISCHARGE SAID CONDENSER, SAID MEANS COMPRISING A MONOSTABLE MULTIVIBRATOR FOR ALTERNATELY GENERATING A NORMAL STABLE VOLTAGE AND AN UNSTABLE VOLTAGE, AN OUTPUT OF SAID MULTIVIBRATOR BEING POLARIZED AND APPLIED TO SAID DIODE TO TURN ON SAID DIODE AND DISCHARGE SAID CONDENSER DURING PERIODS OF SAID UNSTABLE VOLTAGE, AND MEANS COUPLED BETWEEN THE CONTROL CIRCUIT OF SAID MULTIVIBRATOR AND SAID CONDENSER TO TRIGGER SAID MULTIVIBRATOR FROM THE STABLE TO THE UNSTABLE STATE WHEN SAID CONDENSER IS CHARGED TO A PREDETERMINED VOLTAGE.
Claim 2
Dependent Claim
164 words
IN COMBINATION IN AN ANALOG TO DIGITAL CONVERTER, AN INTEGRATING CONDENSER, A CHARGING CIRCUIT COMPRISING THE CONTROLLED PATH OF A TRANSISTOR AND A FIXED BIAS SOURCE CONNECTED ACROSS SAID CONDENSER, THE CONTROLLING CIRCUIT OF SAID TRANSISTOR BEING CONNECTED TO THE ANALOG VOLTAGE SOURCE TO BE CONVERTED, A DISCHARGING CIRCUIT COMPRISING A SWITCHING DIODE CONNECTED ACROSS SAID CONDENSER, MEANS FOR NORMALLY REVERSELY BIASING SAID DIODE TO OFF CONDITIONS DURING THE CHARGING OF SAID CONDENSER, MEANS FOR SELECTIVELY FORWARDLY BIASING SAID DIODE TO ON CONDITION TO DISCHARGE SAID CONDENSER, SAID MEANS COMPRISING A MONOSTABLE MULTIVIBRATOR FOR ALTERNATELY GENERATING A NORMAL STABLE VOLTAGE AND AN UNSTABLE VOLTAGE, AN OUTPUT OF SAID MULTIVIBRATOR BEING POLARIZED AND APPLIED TO SAID DIODE TO TURN ON SAID DIODE AND DISCHARGE SAID CONDENSER DURING PERIODS OF SAID UNSTABLE VOLTAGE, AND MEANS COUPLED BETWEEN THE CONTROL CIRCUIT OF SAID MULTIVIBRATOR AND SAID CONDENSER TO TRIGGER SAID MULTIVIBRATOR FROM THE STABLE TO THE UNSTABLE STATE WHEN SAID CONDENSER IS CHARGED TO A PREDETERMINED VOLTAGE.
References Cited (Backward Citations)
US2957943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |