US3620082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital thermometer
Assignee: United States Department of the Air Force
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Filing: 1970-03-13
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Granted: 1971-11-16
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Expires: 1990-03-13
Abstract
Abstract THROUGH A THERMISTOR PROBE, TEMPERATURE IS CONVERTED INTO A VOLUTAGE WHICH IS INTEGRATED FOR A FIXED PERIOD OF TIME FOLLOWING WHICH A REFERENCE VOLTAGE IS REVERSE INTEGRATED UNTIL THE VALUE IN THE INTEGRATOR IS ZERO. DURING THE REVERSE INTEGRATION A COUNTER OPERATES AND UPON COMPLETION OF THE REVERSE INTEGRATION THE VALUE IN THE COUNTER IS CONVERTED INTO A DECIMAL READOUT INDICACATIVE OF TEMPERATURE. THE COUNTER TRIGGERS MULTIVIBRATOR CIRCUITS WHICH PRODUCE TIMING PULSES FOR ACTIVATING SWITCHES THAT CONTROL THE INPUT TO THE INTEGRATOR FROM THE THERMISTOR CONTROLLED VOLTAGE SOURCE AND THE REFERENCE VOLTAGE SOURCE.
Inventors
- 👤 Wendell R Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:47
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/02; G01K1/028; H; H03; H03M; H03M1/00; H03M1/12; H03M1/50; H03M1/52
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |