Patents by Inventor Dennis Hatfield

Dennis Hatfield 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).

  • Patent number: 7270140
    Abstract: A poppet valve assembly is sized and constructed for insertion into the lower portion of a flow control valve used within the opening of a cylinder for storing a compressed gas. When the flow control valve is removed, the normally open poppet valve assembly of the present invention is closed by escaping pressure of the compressed gas. The pressure of the compressed gas causes seals to be formed within the poppet valve assembly of the present invention between the exterior of a substantially hollow movable seat plug and the interior of a substantially tubular valve body.
    Type: Grant
    Filed: April 26, 2004
    Date of Patent: September 18, 2007
    Inventors: Steven K. Aderholt, Dennis Hatfield, Franklin B. Piehl
  • Publication number: 20040261843
    Abstract: A poppet valve assembly is sized and constructed for insertion into the lower portion of a flow control valve used within the opening of a cylinder for storing a compressed gas. When the flow control valve is removed, the normally open poppet valve assembly of the present invention is closed by escaping pressure of the compressed gas. The pressure of the compressed gas causes seals to be formed within the poppet valve assembly of the present invention between the exterior of a substantially hollow movable seat plug and the interior of a substantially tubular valve body.
    Type: Application
    Filed: April 26, 2004
    Publication date: December 30, 2004
    Inventors: Steven K. Aderholt, Dennis Hatfield, Franklin B. Piehl