Patents by Inventor Donald Ole Johnson

Donald Ole Johnson 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).

  • Publication number: 20040108163
    Abstract: An emergency ladder system and housing assembly developed to provide an alternative route of exit from a multi-story structure in case of a fire or other emergency. The system is designed to mount within the stud wall cavity below an escape opening such as a window. The system is comprised of an enclosure and ladder assembly, which is stowed within the enclosure when not in use. The enclosure door doubles as a step when opened. This provides a person during an emergency a platform to step onto after exiting the escape opening. Additionally, the door can be covered with a material matching the exterior wall of the structure such as siding.
    Type: Application
    Filed: August 21, 2003
    Publication date: June 10, 2004
    Inventor: Donald Ole Johnson