Electricity: measuring and testing – Electrostatic field – Using modulation-type electrometer
Reexamination Certificate
2006-10-27
2008-10-21
Gutierrez, Diego (Department: 2831)
Electricity: measuring and testing
Electrostatic field
Using modulation-type electrometer
C324S072000
Reexamination Certificate
active
07439746
ABSTRACT:
An electrostatic voltmeter has an input sensing terminal, a first operational amplifier, a second operational amplifier, a first reference voltage terminal electrically connected to the non-inverting input of the second operational amplifier, a low reference voltage terminal electrically connected to the output of the second operational amplifier, and a voltage indicator, electrically connected between the low reference voltage terminal and the first reference voltage terminal.
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International Search Report and Written Opinion for PCT/US2007/082705, filed May 2, 2008, Trek, Inc.
Gutierrez Diego
Hodgson & Russ LLP
Nguyen Hoai-An D
Trek, Inc.
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