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US3863147A
Expired / Lapsed
US
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Capacitance sensing apparatus
Assignee: JENSEN III OWEN F
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Filing: 1973-02-16
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Granted: 1975-01-28
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Expires: 1993-02-16
Abstract
Abstract Apparatus is disclosed for remotely responding to the capacitance of a capacitor, such as a capacitor probe being used to measure the level of water in a well. The capacitor is charged by a source of charging voltage through a shielded conductor and a diode provided at or near to a terminal connecting the conductor and the capacitor so that the capacitor may be charged independently of the conductor and source of charging voltage. The capacitor is discharged by a read out device through a second shielded conductor and a resistor provided at or near to a terminal connecting the second conductor and the capacitor.
Inventors
- 👤 Louis W Erath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:57
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2605
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
191 words
Apparatus for remotely measuring the capacitance of a capacitor having first and second spaced elements with a dielectric therebetween and said second element connected to ground comprising, in combination, a first conductor electrically connected to said first element of the capacitor, a pulsating direct current voltage source means electrically connected to the first element through the first conductor for periodically charging the first element through the first conductor, said first conductor including isolation means located adjacent the first element to prevent the charge on the first element from flowing from the first element through the first conductor to the charging means, a second conductor electrically connected to the first element to provide a path through which the charge on the element can be discharged during the periods between charges from the charging means, impedance means located in the second conductor to retard the rate of discharge of the element between charging periods from the voltage source, and enabling means responsive to the discharge of the first element through the second conductor and impedance means to register the discharge current and to indicate the capacitance of the capacitor as a function thereof.
Claim 2
Dependent Claim
191 words
Apparatus for remotely measuring the capacitance of a capacitor having first and second spaced elements with a dielectric therebetween and said second element connected to ground comprising, in combination, a first conductor electrically connected to said first element of the capacitor, a pulsating direct current voltage source means electrically connected to the first element through the first conductor for periodically charging the first element through the first conductor, said first conductor including isolation means located adjacent the first element to prevent the charge on the first element from flowing from the first element through the first conductor to the charging means, a second conductor electrically connected to the first element to provide a path through which the charge on the element can be discharged during the periods between charges from the charging means, impedance means located in the second conductor to retard the rate of discharge of the element between charging periods from the voltage source, and enabling means responsive to the discharge of the first element through the second conductor and impedance means to register the discharge current and to indicate the capacitance of the capacitor as a function thereof.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 in which the impedance means is a resistor.
Claim 4
Dependent Claim
26 words
The apparatus of claim 1 further provided with means for effectively disconnecting the indicating means from the second conductor while the first element is being charged.
Claim 5
Dependent Claim
50 words
The apparatus of claim 3 in which the disconnecting means comprises gate means actuated by the charging voltage to connect the second conductor to ground and divert the flow of current in tHe second conductor from the indicating means while a charging voltage is being applied to the first element.
Claim 6
Dependent Claim
28 words
The apparatus of claim 1 in which the isolation means is a diode arranged to prevent the flow of current from the first element to the voltage source.
References Cited (Backward Citations)
US3243701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |