Patents by Inventor David C. Bradshaw

David C. Bradshaw 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).

  • Vertical marine seismic array
    Patent number: 4970697
    Abstract: A method of acquiring seismic data is disclosed which includes a horizontal towed receiver array in conjunction with at least one vertically oriented receiver array formed from a plurality of receiver elements spaced apart vertically within a plurality of cable. By simultaneously recording the data from both arrays, seismic data can be acquired for locations directly beneath a fixed obstruction, which a towing vessel has had to steer around.
    Type: Grant
    Filed: October 6, 1989
    Date of Patent: November 13, 1990
    Assignee: Amoco Corporation
    Inventors: Ray G. Earley, David C. Bradshaw
  • Precorrelation filtering
    Patent number: 4592031
    Abstract: A time variant filter system is employed for removing spurious noise content from a received seismic data signal. The filter passband tracks delayed versions of the pilot signal of a vibrator seismic source. The resulting recorded portion of the received seismic signal is thus restricted to a desired time-frequency band (which is expected to contain the significant mapping information) prior to being recorded. The band is made adjustable in order to allow for optimization with respect to the particular geologic region being prospected.
    Type: Grant
    Filed: October 18, 1983
    Date of Patent: May 27, 1986
    Assignee: Standard Oil Company (Indiana)
    Inventors: David C. Bradshaw, William C. Robinson, James R. Rossi