Patents by Inventor William B. Pearson

William B. Pearson 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).

  • Liquid flow control
    Patent number: 4257437
    Abstract: A method and apparatus to control the flow of liquid through a valve, especially at very low levels down to about 0.5 ml/hour, by monitoring the liquid level in a column of liquid using a sensor, for example a photo-electric cell, which is moved along the column at a predetermined rate corresponding to the liquid flow rate desired, generating a signal from the sensor which is representative of the liquid level, and using the signal to control the opening and closing of the valve to maintain the liquid flow at the desired rate.
    Type: Grant
    Filed: January 19, 1979
    Date of Patent: March 24, 1981
    Assignee: Imperial Chemical Industries Limited
    Inventor: William B. Pearson