Patents by Inventor William C. Dawson

William C. Dawson 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).

  • Low voltage low current bubble detection circuit
    Patent number: 6515487
    Abstract: A low voltage, low current apparatus for detecting discontinuities, such as bubbles, in a fluid stream, in which a tube is placed between a transducer transmitting successive bursts of ultrasonic energy and for receiving the bursts. The receiving transducer is connected to a low current transistor amplifier circuit of a signal processing circuit which keeps an output in a first state when signals are received corresponding to the presence of a fluid and in a second state when the bursts of energy are modified by the discontinuity.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: February 4, 2003
    Assignee: Magnetrol International, Inc.
    Inventors: William C. Dawson, Mayank H. Patel
  • Environmental recovery system
    Patent number: 5316085
    Abstract: A system for recovering subterranean fluids from a site contaminated by hazardous waste is disclosed. The system for recovering the fluids in a wellbore comprises pump unit means for pumping the subterranean fluid from the wellbore, liquid level sensing means for sensing the liquid level within the wellbore, and activation means for activating the pumping unit means in response to the fluid level sensing means. The system may also include microprocessor means for storing and interpreting the data from the sensing means.
    Type: Grant
    Filed: April 15, 1992
    Date of Patent: May 31, 1994
    Assignee: Exxon Research and Engineering Company
    Inventor: William C. Dawson