US3707873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature measurment
Assignee: Individual
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Filing: 1970-10-02
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Granted: 1973-01-02
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Expires: 1990-10-02
Abstract
Abstract A device for measuring temperature in which an inductance coil surrounds each arm of a glass manometer containing a liquid such as mercury acted on by a temperature expansive liquid such as ethyl alcohol. Each inductance coil forms part of an oscillatory circuit and the outputs of the two oscillatory circuits are compared in a beat frequency mixer to give a digital representation of the temperature.
Inventors
- 👤 R Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:40
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/02; G01K1/024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
A device for measuring temperature, comprising: a manometer containing a liquid arranged to be acted on by a temperature expansive fluid; an inductance coil surrounding each arm of the manometer and arranged so that a change in position of the column of liquid in the arm due to a change in temperature causes a variation in the inductance of the coil; a capacitor coupled to each inductance coil to form therewith first and second resonant circuits; first and second Clapp-type oscillator means, each comprising a transistor; coaxial cable means for connecting said first and second resonant circuits between the collector and emitter and ground of each said transistor, respectively, whereby said first and second Clapp-type oscillator means oscillate at a frequency determined by the variation in inductance of the inductance coil respectively associated therewith; beat frequency mixer means comprising a transistor pair having their respective collector-emitter paths coupled in parallel circuit arrangement to ground through a resistor, first and second inputs for said mixer means comprising the base of each transistor of the pair to which the outputs of said first and second oscillator means are connected, and a mixer output coupled across said resistor, said mixer output defining a digital representation of the temperature being measured.
Claim 2
Independent Claim
207 words
A device for measuring temperature, comprising: a manometer containing a liquid arranged to be acted on by a temperature expansive fluid; an inductance coil surrounding each arm of the manometer and arranged so that a change in position of the column of liquid in the arm due to a change in temperature causes a variation in the inductance of the coil; a capacitor coupled to each inductance coil to form therewith first and second resonant circuits; first and second Clapp-type oscillator means, each comprising a transistor; coaxial cable means for connecting said first and second resonant circuits between the collector and emitter and ground of each said transistor, respectively, whereby said first and second Clapp-type oscillator means oscillate at a frequency determined by the variation in inductance of the inductance coil respectively associated therewith; beat frequency mixer means comprising a transistor pair having their respective collector-emitter paths coupled in parallel circuit arrangement to ground through a resistor, first and second inputs for said mixer means comprising the base of each transistor of the pair to which the outputs of said first and second oscillator means are connected, and a mixer output coupled across said resistor, said mixer output defining a digital representation of the temperature being measured.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |