Patents by Inventor Robert A. Raschke

Robert A. Raschke 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).

  • Nonlinear electroseismic exploration
    Patent number: 6664788
    Abstract: A method for seismic exploration using nonlinear conversions between electromagnetic and seismic energy, with particular attention to the electromagnetic source waveform used. According to the invention, seismic returns from a source waveform are correlated with a reference waveform, with both waveforms custom designed to minimize both correlation side lobes and interference from linear electroseismic effects. A waveform element is selected which may be sequenced by a binary or similar digital code embodying the desired custom design to generate an input sweep with the needed depth penetration and noise suppression. Correlation of the seismic response with the reference waveform in a data processing step mathematically aggregates the seismic response from the input sweep into a single wavelet. Preferred binary digital codes include prescribed variations of maximal length shift-register sequences. Also, an apparatus for generating the desired waveforms.
    Type: Grant
    Filed: April 22, 2002
    Date of Patent: December 16, 2003
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Scott C. Hornbostel, Arthur H. Thompson, Thomas C. Halsey, Robert A. Raschke, Clint A. Davis
  • Nonlinear electroseismic exploration
    Publication number: 20020181326
    Abstract: A method for seismic exploration using nonlinear conversions between electromagnetic and seismic energy, with particular attention to the electromagnetic source waveform used. According to the invention, seismic returns from a source waveform are correlated with a reference waveform, with both waveforms custom designed to minimize both correlation side lobes and interference from linear electroseismic effects. A waveform element is selected which may be sequenced by a binary or similar digital code embodying the desired custom design to generate an input sweep with the needed depth penetration and noise suppression. Correlation of the seismic response with the reference waveform in a data processing step mathematically aggregates the seismic response from the input sweep into a single wavelet. Preferred binary digital codes include prescribed variations of maximal length shift-register sequences. Also, an apparatus for generating the desired waveforms.
    Type: Application
    Filed: April 22, 2002
    Publication date: December 5, 2002
    Inventors: Scott C. Hornbostel, Arthur H. Thompson, Thomas C. Halsey, Robert A. Raschke, Clint A. Davis
  • Nonlinear electroseismic exploration
    Patent number: RE41829
    Abstract: A method for seismic exploration using nonlinear conversions between electromagnetic and seismic energy, with particular attention to the electromagnetic source waveform used. According to the invention, seismic returns from a source waveform are correlated with a reference waveform, with both waveforms custom designed to minimize both correlation side lobes and interference from linear electroseismic effects. A waveform element is selected which may be sequenced by a binary or similar digital code embodying the desired custom design to generate an input sweep with the needed depth penetration and noise suppression. Correlation of the seismic response with the reference waveform in a data processing step mathematically aggregates the seismic response from the input sweep into a single wavelet. Preferred binary digital codes include prescribed variations of maximal length shift-register sequences. Also, an apparatus for generating the desired waveforms.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: October 19, 2010
    Assignee: ExxonMobil Upstream Research Co.
    Inventors: Scott C. Hornbostel, Arthur H. Thompson, Thomas C. Halsey, Robert A. Raschke, Clint A. Davis