Patent US3634757A successfully refreshed from Google Patents.
US3634757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring bridge having a temperature-compensating transistorized voltage stabilizer shunting the power supply to the bridge
Assignee: Charbonnages de France CDF
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Filing: 1969-03-18
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Granted: 1972-01-11
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Expires: 1989-03-18
Abstract
Abstract A direct-current supply circuit for apparatus of the type in which a measuring bridge is provided comprising at least one electric dosing filament, the resistance of which is a function of a value to be measured. The said circuit comprises a source of direct current of regulated intensity connected in series with the measuring bridge and a shunt voltage stabilizer circuit with transistors, connected directly to the terminals of the measuring bridge and which shunts at any moment the desired portion of the supply current of regulated intensity, so that the voltage at the terminals of the bridge is maintained at the desired value.
Inventors
- 👤 Alexandre Monomakhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:52
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
191 words
An apparatus of the fire-damp detector type having a measuring bridge equipped with at least one electric dosing filament, the resistance of which is a function of a value to be measure, comprising: a source of direct current of regulated intensity; said source being connected in series with said measuring bridge; and a shunt-voltage-stabilizing circuit with transistors; said stabilizer circuit being connected directly to the supply terminals of said measuring bridge and being constituted at least by: a voltage divider with two variable resistances having a common point and connected in series to the supply terminals of said measuring bridge; a transistor stage having a load resistance with its base connected to said common point of said voltage divider, said transistor stage having an end of said load resistance and an electrode connected to the supply terminals of said measuring bridge; and a temperature-compensating resistance means including a temperature-compensating resistance and at least one additional resistance having a point in common and connected in series across the supply terminals of said measuring bridge, said point in common being connected by a further resistive means to the base of said transistor stage.
Claim 2
Independent Claim
191 words
An apparatus of the fire-damp detector type having a measuring bridge equipped with at least one electric dosing filament, the resistance of which is a function of a value to be measure, comprising: a source of direct current of regulated intensity; said source being connected in series with said measuring bridge; and a shunt-voltage-stabilizing circuit with transistors; said stabilizer circuit being connected directly to the supply terminals of said measuring bridge and being constituted at least by: a voltage divider with two variable resistances having a common point and connected in series to the supply terminals of said measuring bridge; a transistor stage having a load resistance with its base connected to said common point of said voltage divider, said transistor stage having an end of said load resistance and an electrode connected to the supply terminals of said measuring bridge; and a temperature-compensating resistance means including a temperature-compensating resistance and at least one additional resistance having a point in common and connected in series across the supply terminals of said measuring bridge, said point in common being connected by a further resistive means to the base of said transistor stage.
Claim 3
Dependent Claim
176 words
A direct-current supply circuit for measuring bridge apparatus provided with at least one electric dosing filament, the resistance of which is a function of a value to be measured, comprising a source of direct current at regulated intensity connected in series with the measuring bridge apparatus; and a voltage-stabilizing circuit connected to the supply terminals of said measuring bridge and including a voltage divider with two variable reSistances having a common point and connected across the supply terminals of said measuring bridge, a first transistor stage having a load resistance with its base connected to said common point of said voltage divider, at least one additional transistor stage having a load resistance and its base connected to the previous stage, said transistor stages each having an end of said load resistance and an electrode connected to the supply terminals of said measuring bridge, and a temperature-compensating resistance means including a temperature-compensating resistance and at least one additional resistance connected across the supply terminals of said measuring bridge and to the base of said first transistor stage.
Claim 4
Dependent Claim
176 words
A direct-current supply circuit for measuring bridge apparatus provided with at least one electric dosing filament, the resistance of which is a function of a value to be measured, comprising a source of direct current at regulated intensity connected in series with the measuring bridge apparatus; and a voltage-stabilizing circuit connected to the supply terminals of said measuring bridge and including a voltage divider with two variable reSistances having a common point and connected across the supply terminals of said measuring bridge, a first transistor stage having a load resistance with its base connected to said common point of said voltage divider, at least one additional transistor stage having a load resistance and its base connected to the previous stage, said transistor stages each having an end of said load resistance and an electrode connected to the supply terminals of said measuring bridge, and a temperature-compensating resistance means including a temperature-compensating resistance and at least one additional resistance connected across the supply terminals of said measuring bridge and to the base of said first transistor stage.
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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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |