Patents by Inventor Duane Darnell

Duane Darnell 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).

  • Systems for a fire-resistant door jamb
    Patent number: 7921603
    Abstract: A fire-resistant door jamb system may incorporate wood components, fire-resistant material, intumescent material and may include a bracket set including an L-shaped fixed bracket for installing a door jamb assembly in a wall.
    Type: Grant
    Filed: December 8, 2004
    Date of Patent: April 12, 2011
    Inventor: Duane Darnell
  • Fire door
    Patent number: 7669383
    Abstract: A fire door designed to slow the progress of a fire in a dwelling or commercial building. More particularly, a fire door having one or more vertical stiles that include a layer of intumescent material.
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: March 2, 2010
    Assignee: Warm Springs Composite Products
    Inventor: Duane Darnell
  • Fire door
    Publication number: 20060207199
    Abstract: A fire door designed to slow the progress of a fire in a dwelling or commercial building. More particularly, a fire door having one or more vertical stiles that include a layer of intumescent material.
    Type: Application
    Filed: February 15, 2006
    Publication date: September 21, 2006
    Inventor: Duane Darnell
  • Systems and installation methods for a fire-resistant door jamb
    Publication number: 20060048466
    Abstract: A fire-resistant door jamb system may incorporate wood components, intumescent material and a flexible bracket system for installing a doorjamb system in a wall.
    Type: Application
    Filed: December 8, 2004
    Publication date: March 9, 2006
    Inventor: Duane Darnell