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Browse by Category: Main > Communications
Class Information
Number: 367/190
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Vibrator-type transmitter > With feedback control
Description: Subject matter in which a portion of the output of the generator is used to control the operation of the generator itself.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8588030 Reducing noise in seismic surveying environment Nov. 19, 2013
8375560 Method for manufacturing a condenser microphone Feb. 19, 2013
8371416 Constant holddown weight for vibratory seismic sources Feb. 12, 2013
8134891 Apparatus for generating a seismic source signal Mar. 13, 2012
7987943 Apparatus and method for generating a seismic source signal Aug. 2, 2011
7974152 Control system for marine vibrators and seismic acquisition system using such control system Jul. 5, 2011
7974154 Vibroseis calibration technique and system Jul. 5, 2011
7929380 Apparatus and method for generating a seismic source signal Apr. 19, 2011
7859945 Efficient seismic data acquisition with source separation Dec. 28, 2010
7841444 Seismic vibrator baseplate Nov. 30, 2010
7628248 Apparatus and method for generating a seismic source signal Dec. 8, 2009
7519480 Driving-force output of a reciprocating actuator Apr. 14, 2009
7382684 Method for selective bandlimited data acquisition in subsurface formations Jun. 3, 2008
7364008 System for imparting mechanical impulse energy to the ground Apr. 29, 2008
6460803 System for control of active system for vibration and noise reduction Oct. 8, 2002
5412623 Multivibrator waveform monitoring system May. 2, 1995
5410517 Method for cascading sweeps for a seismic vibrator Apr. 25, 1995
5400299 Seismic vibrator signature deconvolution Mar. 21, 1995
5331607 Sweep frequency vibrator Jul. 19, 1994
5327399 Multivibrator waveform monitoring system Jul. 5, 1994
5128908 Pressure feedback servovalve for a seismic vibrator Jul. 7, 1992
5117926 Method and system for controlling vibrations in borehole equipment Jun. 2, 1992
4980874 Method and apparatus for maximizing seismic shear wave production Dec. 25, 1990
4930113 Suppression of air-coupled noise produced by seismic vibrators May. 29, 1990
4855967 Seismic vibrator hold-down weight monitor/controller Aug. 8, 1989
4821246 Electromagnetic vibrator for seismic and civil-engineering applications Apr. 11, 1989
4785431 Broad-band hydraulic vibrator Nov. 15, 1988
4782446 Vibrator quality control method and system Nov. 1, 1988
4779243 Transducer array velocity sensor and processor system Oct. 18, 1988
4766576 Seismic source vibrator having improved sweep generator Aug. 23, 1988
4751687 Methods of reducing harmonic distortion in continuous wave seismic exploration Jun. 14, 1988
4750157 Seismic vibrator earth impedance determination and compensation system Jun. 7, 1988
4723231 Source tunable array for ground roll reduction Feb. 2, 1988
4706231 Reaction mass acceleration feedback device Nov. 10, 1987
4692912 Automatic force control for a seismic vibrator Sep. 8, 1987
4670863 Vibrator seismic source having adaptive distortion limiting control system Jun. 2, 1987
4654836 Seismic vibrator source having improved phase detector Mar. 31, 1987
4637002 Seismic source vibrator having self tuning controller Jan. 13, 1987
4616352 Vibrator seismic source having distortion limiting control system Oct. 7, 1986
4567583 Adaptive preset force level control for a seismic vibrator Jan. 28, 1986
4564927 Method and apparatus for testing seismic vibrators Jan. 14, 1986
4537077 Load dynamics compensation circuit for servohydraulic control systems Aug. 27, 1985
4538203 Passive mass-spring type of sensing device having electronic damping Aug. 27, 1985
4519053 Force or pressure feedback control for seismic vibrators May. 21, 1985
4516230 Protective drive-level limiter for an electro-hydraulic vibrator May. 7, 1985
4500976 Seismic exploration Feb. 19, 1985
4265331 Fluidic repeater May. 5, 1981
4173749 Digital drive and phase-lock for seismic vibrators Nov. 6, 1979
4095425 Control system for rotary air modulator Jun. 20, 1978
4068210 Seismic vibrator phase detector Jan. 10, 1978

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