Patents by Inventor Adrianus B. Kalden

Adrianus B. Kalden 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).

  • Suppressing constant frequency noise in seismic records
    Patent number: 4104611
    Abstract: A method and apparatus for removing a sinusoidal noise signal having constant amplitude and phase from a seismic signal. The noise signal is continuously monitored to detect its phase and zero crossing of the noise signal to generate first and second trigger signals. The trigger signals are used to control the recording of seismic signals resulting from consecutive firings of a seismic source. Then, depending upon the polarity of the seismic source, the recorded signals are either added or subtracted to remove the unwanted noise signal.
    Type: Grant
    Filed: April 21, 1977
    Date of Patent: August 1, 1978
    Assignee: Shell Oil Company
    Inventor: Adrianus B. Kalden