Patents by Inventor Keith Lynn Lewallen

Keith Lynn Lewallen 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).

  • Multi-layered fire door and method for making the same
    Patent number: 7721500
    Abstract: A door has a core that includes a porous layer having a thickness and two opposing major surfaces. In one construction, the core also includes three fire-retardant layers, and two of the fire-retardant layers are separated by the porous layer. The porous layer and the fire-retardant layers are coupled together. Other constructions include one or more fire-retardant layers in balanced or unbalanced placement around the porous layer.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: May 25, 2010
    Assignee: JELD-WEN, inc.
    Inventors: Randy Jon Clark, Gary Lee Koepke, Keith Lynn Lewallen, Brent David Olson, William Robert Transue
  • Multi-layered fire door and method for making the same
    Patent number: 7185468
    Abstract: A door has a core that includes a porous layer having a thickness and two opposing major surfaces. In one construction, the core also includes three fire-retardant layers, and two of the fire-retardant layers are separated by the porous layer. The porous layer and the fire-retardant layers are coupled together. Other constructions include one or more fire-retardant layers in balanced or unbalanced placement around the porous layer.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: March 6, 2007
    Assignee: Jeld-Wen, inc.
    Inventors: Randy Jon Clark, Gary Lee Koepke, Keith Lynn Lewallen, Brent David Olson, William Robert Transue
  • Multi-layered fire door and method for making the same
    Publication number: 20040226245
    Abstract: A door has a core that includes a porous layer having a thickness and two opposing major surfaces. In one construction, the core also includes three fire-retardant layers, and two of the fire-retardant layers are separated by the porous layer. The porous layer and the fire-retardant layers are coupled together. Other constructions include one or more fire-retardant layers in balanced or unbalanced placement around the porous layer.
    Type: Application
    Filed: October 31, 2002
    Publication date: November 18, 2004
    Inventors: Randy Jon Clark, Gary Lee Koepke, Keith Lynn Lewallen, Brent David Olson, William Robert Transue