Patents by Inventor Allan H. Mueller

Allan H. Mueller has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Vibrator response linearization circuit
    Patent number: 4724532
    Abstract: A method and apparatus for driving a seismic hydraulic vibrator in which a conventional sinusoidal drive signal in modified in such a manner as to improve vibrator response parameters. The sinusoidal drive signal is modified such that in the regions of the signal proximate the reference axis, the signal will abruptly pass from one side of the reference axis to the other side of the reference axis. This modification is accomplished by summing a square wave signal with the sinusoidal signal to form a composite drive signal.
    Type: Grant
    Filed: August 5, 1985
    Date of Patent: February 9, 1988
    Assignee: Geosource, Inc.
    Inventors: Dean P. Perkins, Allan H. Mueller
  • Reaction mass acceleration feedback device
    Patent number: 4706231
    Abstract: An improvement for the drive control system of a vibratory sound source used in seismic exploration comprising apparatus for generating a feedback signal proportional to the instantaneous acceleration of the reaction mass structure of the sound source's hydraulic drive system. Degenerative feedback of the signal so developed is used to reduce distortion of the vibratory seismic signal imparted into the earth.
    Type: Grant
    Filed: July 29, 1985
    Date of Patent: November 10, 1987
    Assignee: Geosource Inc.
    Inventors: Allan H. Mueller, Dean P. Perkins
  • Automatic force control for a seismic vibrator
    Patent number: 4692912
    Abstract: The present invention provides a method and apparatus for controlling the response of a seismic vibrator during its actuation period. The sweep input signal is modified in response to an average of the force applied to the earth by the vibrator over at least one cycle of the sweep signal. Additionally, this modified drive signal may be further adjusted by selective adjustment of the amplitude of the signal within selected frequency ranges.
    Type: Grant
    Filed: November 30, 1984
    Date of Patent: September 8, 1987
    Assignee: Geosource, Inc.
    Inventors: Allan H. Mueller, Dean P. Perkins, Rhys M. Evans