Patents by Inventor Keith Lewallen

Keith 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
    Publication number: 20070125043
    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: January 23, 2007
    Publication date: June 7, 2007
    Inventors: Randy Clark, Gary Koepke, Keith Lewallen, Brent Olson, William Transue
  • Multi-layered fire door and method for making the same
    Publication number: 20070125044
    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: January 23, 2007
    Publication date: June 7, 2007
    Inventors: Randy Clark, Gary Koepke, Keith Lewallen, Brent Olson, William Transue