Patents by Inventor Paul Thomas Fredell

Paul Thomas Fredell 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 freeze prevention of irrigation systems
    Patent number: 5694963
    Abstract: There is disclosed an apparatus for freeze prevention protecting an irrigation system. The response of the apparatus depends on environmental conditions. At a first temperature condition, the irrigation system is shut down. At a lower temperature condition, the system remains shut down and heat is delivered to the above ground portions of the system. In the event temperatures continue to decrease, a full drainage of the above ground portion of the irrigation system will be accomplished and alarm notification will be given.
    Type: Grant
    Filed: December 4, 1995
    Date of Patent: December 9, 1997
    Inventors: Paul Thomas Fredell, Brett William Floyd, Marc Jay Stein