Patents by Inventor David Ray Sundberg

David Ray Sundberg 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 controller for determining carbon dioxide emissions from a recirculating air heater
    Patent number: 7104460
    Abstract: A method of determining the amount of air flowing through an outside air damper of a recirculating air heater includes the steps of sensing an amount of airflow flowing through the damper, recording the amount of airflow and a damper position value at a plurality of damper positions, and interpolating a curve relating the amount of airflow to the damper position for all damper positions between a minimum damper position and a maximum damper position. Once the amount of air flowing through the outside air damper is determined from a position on the curve, the concentration of carbon dioxide (CO2) within a building space can be calculated and/or determined to be within acceptable limits.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: September 12, 2006
    Assignee: Maxitrol Company
    Inventors: Mark Geoffrey Masen, David Ray Sundberg, John James Schlachter, Frank Phillip Mimick