US3197699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical moisture sensing device
Assignee: Danfoss AS
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Filing: 1964-03-05
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Granted: 1965-07-27
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Expires: 1984-03-05
Abstract
No abstract record available.
Inventors
- 👤 Johansen Knud Harald Storm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:10
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/56; G01N25/62; G01N25/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
213 words
IN AN ELECTRICAL MOISTURE SENSING DEVICE, AN ELECTRICAL CIRCUIT COMPRISING, A FULL-WAVE BRIDGE RECTIFIER HAVING TWO SETS OF ALTERNATE JUNCTIONS COMPRISING A SET OF A.-C. JUNCTIONS AND A SET OF D.-C. JUNCTIONS, A LOAD RESISTOR CONNECTED BETWEEN SAID D.-C. JUNCTIONS, AN A.-C. SOURCE CONNECTED ACROSS SAID BRIDGE RECTIFIER TO SAID A.-C. JUNCTIONS FOR APPLYING A SUBSTANTIALLY CONSTANT A.-C. VOLTAGE TO SAID BRIDGE RECTIFIER, A CURRENT-CONDUCTING MOISTURE SENSOR CAPABLE OF ABSORBING MOISTURE AND HAVING THE CHARACTERISTIC OF VARYING IN CONDUCTIVITY PROPORTIONATELY TO THE MOISTURE ABSORBED AND CONNECTED TO ONE OF SAID A.-C. JUNCTIONS IN SERIES WITH SAID A.-C. SOURCE FOR DEVELOPING A D.-C. VOLTAGE CORRESPONDING TO A RECTIFIED A.-C. VOLTAGE APPLIED TO SAID BRIDGE RECTIFIER AND VARIABLY PROPORTIONATE TO THE CONDUCTIVITY OF SAID SENSOR, AN ADJUSTABLE D.-C. SOURCE CONNECTED TO SAID BRIDGE RECTIFIER FOR APPLYING A KNOWN SECOND D.-C. VOLTAGE TO SAID BRIDGE RECTIFIER OF A POLARITY OPPOSITE TO THE POLARITY OF SAID FIRST D.-C. VOLTAGE TO DEVELOP A DIFFERENCE VOLTAGE BETWEEN SAID FIRST AND SECOND D.-C. VOLTAGES AND REPRESENTATIVE OF THE CHANGE IN CONDUCTIVITY OF SAID SENSOR, AND VOLTAGE-RESPONSIVE MEANS CONNECTED TO SAID BRIDGE RECTIFIER TO RESPOND TO SAID DIFFERENCE VOLTAGE, AND MEANS FOR SUPERIMPOSING AN A.-C. VOLTAGE ON SAID ADJUSTABLE D.-C. SOURCE TO IMPROVE THE ACCURACY, AND SENSITIVITY OF THE DIFFERENTIAL VALUES.
Claim 2
Dependent Claim
213 words
IN AN ELECTRICAL MOISTURE SENSING DEVICE, AN ELECTRICAL CIRCUIT COMPRISING, A FULL-WAVE BRIDGE RECTIFIER HAVING TWO SETS OF ALTERNATE JUNCTIONS COMPRISING A SET OF A.-C. JUNCTIONS AND A SET OF D.-C. JUNCTIONS, A LOAD RESISTOR CONNECTED BETWEEN SAID D.-C. JUNCTIONS, AN A.-C. SOURCE CONNECTED ACROSS SAID BRIDGE RECTIFIER TO SAID A.-C. JUNCTIONS FOR APPLYING A SUBSTANTIALLY CONSTANT A.-C. VOLTAGE TO SAID BRIDGE RECTIFIER, A CURRENT-CONDUCTING MOISTURE SENSOR CAPABLE OF ABSORBING MOISTURE AND HAVING THE CHARACTERISTIC OF VARYING IN CONDUCTIVITY PROPORTIONATELY TO THE MOISTURE ABSORBED AND CONNECTED TO ONE OF SAID A.-C. JUNCTIONS IN SERIES WITH SAID A.-C. SOURCE FOR DEVELOPING A D.-C. VOLTAGE CORRESPONDING TO A RECTIFIED A.-C. VOLTAGE APPLIED TO SAID BRIDGE RECTIFIER AND VARIABLY PROPORTIONATE TO THE CONDUCTIVITY OF SAID SENSOR, AN ADJUSTABLE D.-C. SOURCE CONNECTED TO SAID BRIDGE RECTIFIER FOR APPLYING A KNOWN SECOND D.-C. VOLTAGE TO SAID BRIDGE RECTIFIER OF A POLARITY OPPOSITE TO THE POLARITY OF SAID FIRST D.-C. VOLTAGE TO DEVELOP A DIFFERENCE VOLTAGE BETWEEN SAID FIRST AND SECOND D.-C. VOLTAGES AND REPRESENTATIVE OF THE CHANGE IN CONDUCTIVITY OF SAID SENSOR, AND VOLTAGE-RESPONSIVE MEANS CONNECTED TO SAID BRIDGE RECTIFIER TO RESPOND TO SAID DIFFERENCE VOLTAGE, AND MEANS FOR SUPERIMPOSING AN A.-C. VOLTAGE ON SAID ADJUSTABLE D.-C. SOURCE TO IMPROVE THE ACCURACY, AND SENSITIVITY OF THE DIFFERENTIAL VALUES.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |