Patents by Inventor Jacobus P. Van Wyk

Jacobus P. Van Wyk 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).

  • Rate of change detection
    Patent number: 4309663
    Abstract: A method of monitoring the rate of change of a first signal which includes the steps of periodically sampling the first signal, generating a first reference signal which for each period differs from the sampled amplitude of the first signal by a predetermined amount, comparing the amplitudes of the first signal and of the first reference signal, and generating an output signal when the amplitude of the first signal crosses the amplitude of the first reference signal.The invention also provides apparatus for monitoring the rate of change of a first signal which comprises means periodically to sample the first signal, means to generate a first reference signal which for each period differs from the sampled amplitude of the first signal by a predetermined amount, and means to compare the amplitudes of the first signal and of the first reference signal and to generate an output signal when the amplitude of the first signal crosses the amplitude of the first reference signal.
    Type: Grant
    Filed: April 30, 1979
    Date of Patent: January 5, 1982
    Inventors: Bernardus J. Bout, Jacobus P. Van Wyk
  • Battery testing method and device
    Patent number: 4290021
    Abstract: The invention provides apparatus for testing the condition of a battery comprising a load, means to connect the battery to the load for a predetermined interval and means to measure the battery voltage at least at the end of the interval.The invention further extends to apparatus for successively testing the condition of a plurality of batteries comprising means for connecting one of the batteries to a given load for a predetermined interval, means for measuring the voltage of the battery at least at the end of the interval, means for determining the condition of the battery from the voltage measurement, and control means for connecting a fresh battery to the load and repeating the testing of the batteries until all the batteries are tested.The invention also provides a method of testing the condition of a battery including the steps of connecting the battery in a charged condition to a load for a predetermined interval, and measuring the battery voltage at least at the end of the interval.
    Type: Grant
    Filed: May 1, 1979
    Date of Patent: September 15, 1981
    Inventors: Jacob J. Theron, Bernardus J. Bout, Jacobus P. Van Wyk, Michael D. De Lange