Patents by Inventor Robert I. Annas

Robert I. Annas 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).

  • Method and apparatus for monitoring fluid flow through a drill string
    Patent number: 4188624
    Abstract: A method and apparatus are disclosed for monitoring fluid flow through a drilling string in order to detect a wash-out or a restriction. The apparatus includes circuitry for sensing the rate of pumping of a fluid, circuitry for sensing the pressure of the fluid being pumped, a function generator to process a pressure signal and a pump rate signal and generate a fluid flow indication signal, circuitry to actuate an alarm, and an alarm. The method includes sensing the pumping rate, sensing the pressure, and generating a fluid flow indication signal that gives an indication of the relationship between the pumping rate and pressure.
    Type: Grant
    Filed: June 30, 1978
    Date of Patent: February 12, 1980
    Assignee: NL Industries, Inc.
    Inventors: Dennis H. Hochsprung, Alan C. Wright, Robert I. Annas, Pat W. Purcell