US4090151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature sensing device for producing alternating electric signals whose period is a function of a temperature
Assignee: Thales Avionics SAS
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Filing: 1977-01-19
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Granted: 1978-05-16
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Expires: 1997-01-19
Abstract
Abstract A device for producing at the output of a multivibrator an electric signal the period of which is a linear function of a temperature to which is subjected the measuring probe, characterized in that said multivibrator consists in a comparator whose first input comprises the probe, said probe consists in at least two semi-conducting junctions connected two by two in parallel and in opposite directions, and the other components of the device, particularly those of the second comparator input comprising a capacitor, remains invariable.
Inventors
- 👤 Rene Presset
- 👤 Michel Torregrosa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:33
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/22; G01K7/24; G01K7/245; G01K1/00; G01K1/02; G01K1/028; G01K7/18; G01K7/20; G01K7/203
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A temperature sensing device for producing an alternating electric signal the period of which is linear function of the temperature being measured, said device comprising: a first sensing probe comprising at least two semiconductor junctions connected in parallel and poled in opposition to each other; and a multivibrator comprising an amplifier-comparator having first and second inputs and an output, said first input connected to said first sensing probe, a first resistor connected between said first sensing probe and said output, a first capacitor and a second resistor, said first capacitor and said second resistor connected in series between said second input and said output.
Claim 2
Dependent Claim
104 words
A temperature sensing device for producing an alternating electric signal the period of which is linear function of the temperature being measured, said device comprising: a first sensing probe comprising at least two semiconductor junctions connected in parallel and poled in opposition to each other; and a multivibrator comprising an amplifier-comparator having first and second inputs and an output, said first input connected to said first sensing probe, a first resistor connected between said first sensing probe and said output, a first capacitor and a second resistor, said first capacitor and said second resistor connected in series between said second input and said output.
Claim 3
Dependent Claim
29 words
The device of claim 1, wherein said temperature being measured is a temperature differential and said device includes a second sensing probe connected in series with said first capacitor.
Claim 4
Dependent Claim
100 words
The device of claim 2, wherein said device further includes a voltage regulator connected to said output, a second capacitor, and first and second current generators, said voltage regulator comprising a third resistor and two Zener diodes connected in series and poled in opposition to each other, said first current generator for supplying said first probe with a constant current, said first current generator including said first resistor, said second current generator connected to said second input for supplying said second probe with a constant current, said second capacitor for decreasing a lower limit of said period at said output.
References Cited (Backward Citations)
US3440883A
Cited
US3604957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |