Patents by Inventor Richard E. DuBroff

Richard E. DuBroff 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).

  • Seismic exploration
    Patent number: 4500976
    Abstract: In a seismic exploration system, the waveforms provided from a plurality of seismic sources are phase shifted so as to maximize the strength of signals received by a plurality of seismic receivers and the signals output from the plurality of seismic receivers are phase shifted so as to substantially maximize the strength of the composite signal which results from the summation of the output from the plurality of seismic receivers.
    Type: Grant
    Filed: June 7, 1982
    Date of Patent: February 19, 1985
    Assignee: Phillips Petroleum Company
    Inventor: Richard E. DuBroff
  • Phase shifting of waveforms
    Patent number: 4367542
    Abstract: A signal having the form cos (.OMEGA.t+.phi.) where .OMEGA. is the frequency of the signal and .phi. is a phase angle which may be zero is phase shifted to improve the results of the summation of such a signal with other signals having the same form but different phase angles.
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: January 4, 1983
    Assignee: Phillips Petroleum Company
    Inventor: Richard E. DuBroff