Patents by Inventor William H. Hawthorne

William H. Hawthorne 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).

  • Fischer-tropsch slurry reactor cooling tube arrangement
    Patent number: 7108835
    Abstract: An arrangement of cooling tubes within a Fischer-Tropsch slurry reactor simplifies removal and reinstallation of cooling tubes for reactor maintenance.
    Type: Grant
    Filed: October 8, 2003
    Date of Patent: September 19, 2006
    Assignee: Rentech, Inc.
    Inventors: William H. Hawthorne, Mark D. Ibsen, Peter S. Pedersen, Mark S. Bohn
  • System for controlling addition of lime to reduce water alkalinity
    Patent number: 5340468
    Abstract: A system for regulating the addition of lime to reduce water alkalinity includes two sensors for measuring the conductivity of the water prior to and after addition of lime, a pump for adding lime to the water, and a controller for regulating the pump. The controller periodically samples the conductivities measured by both sensors and computes the ratio of the conductivities for each sample as well as the slope of the ratio between samples. The controller turns the pump off when the conductivity ratio exceeds a predetermined maximum set point and the slope is positive, and turns the pump on when the conductivity ratio falls below a predetermined minimum set point and the slope is negative.
    Type: Grant
    Filed: March 31, 1993
    Date of Patent: August 23, 1994
    Assignee: Hawthorne Treatment Systems, Inc.
    Inventors: William H. Hawthorne, Gary J. Herbert