Patent US3887877A successfully refreshed from Google Patents.
US3887877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feedback electrostatic voltmeter
Assignee: Individual
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Filing: 1973-03-26
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Granted: 1975-06-03
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Expires: 1993-03-26
Abstract
Abstract This invention relates to an electrostatic voltmeter which provides accurate measurement of the electrostatic potential of a small surface area, without physical contact therewith. More particularly, it relates to the utilization of solid state elements to provide improved transient response, characterized by superior performance, stability, reliability and ease of maintenance of an electrostatic voltmeter.
Inventors
- 👤 Robert E Vosteen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:29
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/18; G01R29/00; G01R29/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
354 words
A high gain amplifier system comprising: an operational amplifier having an input and an output, a square wave drive source of predetermined frequency, a first inverter means having first and second transistors, each having a base, an emitter and a collector electrode, the source of square waves being connected across the base electrodes of the first and second transistors to alternately drive them into conduction at the predetermined frequency. a first step-up transformer having a center-tapped primary winding and a secondary winding, the primary winding being connected across corresponding electrodes of the first and second transistors other than the base electrodes, the remaining corresponding electrodes of the first and second transistors other than the base electrodes being connected to form a first common connection, a second inverter means having third and fourth transistors, each having a base, an emitter and collector electrode, the source of square waves being connected across the base electrodes of the third and fourth transistors to alternately drive them into conduction at the predetermined frequency, a second step-up transformer having a center-tapped primary winding and a secondary winding, the primary winding being connected across corresponding electrodes of the third and fourth transistors other than the base electrodes, the remaining corresponding electrodes of the third and fourth transistors other than the base electrodes being connected to form a second common connection, a power supply having positive and negative supply terminals, one of the supply terminals being connected to the center tap of the primary winding of the first step-up transformer, the other supply terminal being connected to the second common connection, means connecting the output of the operational amplifier to feed the first common connection and the center-tap of the primary winding of the second step-up transformer, the first and second inverters thereby providing output signals to the first and second step-up transformers respectively dependent upon the magnitude and polarity of the output of the operational amplifier and modulated at the predetermined frequency, first and second demodulators connected to the secondary windings of the first and second step-up transformers respectively to demodulate the outputs thereof to produce high gain output signals.
Claim 2
Dependent Claim
354 words
A high gain amplifier system comprising: an operational amplifier having an input and an output, a square wave drive source of predetermined frequency, a first inverter means having first and second transistors, each having a base, an emitter and a collector electrode, the source of square waves being connected across the base electrodes of the first and second transistors to alternately drive them into conduction at the predetermined frequency. a first step-up transformer having a center-tapped primary winding and a secondary winding, the primary winding being connected across corresponding electrodes of the first and second transistors other than the base electrodes, the remaining corresponding electrodes of the first and second transistors other than the base electrodes being connected to form a first common connection, a second inverter means having third and fourth transistors, each having a base, an emitter and collector electrode, the source of square waves being connected across the base electrodes of the third and fourth transistors to alternately drive them into conduction at the predetermined frequency, a second step-up transformer having a center-tapped primary winding and a secondary winding, the primary winding being connected across corresponding electrodes of the third and fourth transistors other than the base electrodes, the remaining corresponding electrodes of the third and fourth transistors other than the base electrodes being connected to form a second common connection, a power supply having positive and negative supply terminals, one of the supply terminals being connected to the center tap of the primary winding of the first step-up transformer, the other supply terminal being connected to the second common connection, means connecting the output of the operational amplifier to feed the first common connection and the center-tap of the primary winding of the second step-up transformer, the first and second inverters thereby providing output signals to the first and second step-up transformers respectively dependent upon the magnitude and polarity of the output of the operational amplifier and modulated at the predetermined frequency, first and second demodulators connected to the secondary windings of the first and second step-up transformers respectively to demodulate the outputs thereof to produce high gain output signals.
Claim 3
Dependent Claim
354 words
A high gain amplifier system comprising: an operational amplifier having an input and an output, a square wave drive source of predetermined frequency, a first inverter means having first and second transistors, each having a base, an emitter and a collector electrode, the source of square waves being connected across the base electrodes of the first and second transistors to alternately drive them into conduction at the predetermined frequency. a first step-up transformer having a center-tapped primary winding and a secondary winding, the primary winding being connected across corresponding electrodes of the first and second transistors other than the base electrodes, the remaining corresponding electrodes of the first and second transistors other than the base electrodes being connected to form a first common connection, a second inverter means having third and fourth transistors, each having a base, an emitter and collector electrode, the source of square waves being connected across the base electrodes of the third and fourth transistors to alternately drive them into conduction at the predetermined frequency, a second step-up transformer having a center-tapped primary winding and a secondary winding, the primary winding being connected across corresponding electrodes of the third and fourth transistors other than the base electrodes, the remaining corresponding electrodes of the third and fourth transistors other than the base electrodes being connected to form a second common connection, a power supply having positive and negative supply terminals, one of the supply terminals being connected to the center tap of the primary winding of the first step-up transformer, the other supply terminal being connected to the second common connection, means connecting the output of the operational amplifier to feed the first common connection and the center-tap of the primary winding of the second step-up transformer, the first and second inverters thereby providing output signals to the first and second step-up transformers respectively dependent upon the magnitude and polarity of the output of the operational amplifier and modulated at the predetermined frequency, first and second demodulators connected to the secondary windings of the first and second step-up transformers respectively to demodulate the outputs thereof to produce high gain output signals.
Claim 4
Dependent Claim
354 words
A high gain amplifier system comprising: an operational amplifier having an input and an output, a square wave drive source of predetermined frequency, a first inverter means having first and second transistors, each having a base, an emitter and a collector electrode, the source of square waves being connected across the base electrodes of the first and second transistors to alternately drive them into conduction at the predetermined frequency. a first step-up transformer having a center-tapped primary winding and a secondary winding, the primary winding being connected across corresponding electrodes of the first and second transistors other than the base electrodes, the remaining corresponding electrodes of the first and second transistors other than the base electrodes being connected to form a first common connection, a second inverter means having third and fourth transistors, each having a base, an emitter and collector electrode, the source of square waves being connected across the base electrodes of the third and fourth transistors to alternately drive them into conduction at the predetermined frequency, a second step-up transformer having a center-tapped primary winding and a secondary winding, the primary winding being connected across corresponding electrodes of the third and fourth transistors other than the base electrodes, the remaining corresponding electrodes of the third and fourth transistors other than the base electrodes being connected to form a second common connection, a power supply having positive and negative supply terminals, one of the supply terminals being connected to the center tap of the primary winding of the first step-up transformer, the other supply terminal being connected to the second common connection, means connecting the output of the operational amplifier to feed the first common connection and the center-tap of the primary winding of the second step-up transformer, the first and second inverters thereby providing output signals to the first and second step-up transformers respectively dependent upon the magnitude and polarity of the output of the operational amplifier and modulated at the predetermined frequency, first and second demodulators connected to the secondary windings of the first and second step-up transformers respectively to demodulate the outputs thereof to produce high gain output signals.
Claim 5
Dependent Claim
33 words
The high gain amplifier system as recited in claim 1 wherein there are further provided: combining means connected to the outputs of said first and second demodulators to produce a single signal output.
Claim 6
Dependent Claim
30 words
The high gAin amplifier as recited in claim 2 wherein there is further provided: an integrating capacitor connected between said combining means and the input of the operational amplifier system.
References Cited (Backward Citations)
US3234478A
Cited
US3407358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |