Patents by Inventor John B. Walden

John B. Walden 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).

  • Extendable A-frame ladder for uneven surfaces
    Patent number: 6604607
    Abstract: An A-frame ladder able to be on uneven surfaces, stairs or level surfaces in a stable and level configuration, includes a sliding ladder segment attached to the A-frame ladder segments, locking bars on the sliding ladder segments spaced apart along the sliding ladder segments, sliding bracket mounts attaching each sliding ladder segment to the A-frame ladder segments, and pivoting spring-loaded locking catches securing the sliding ladder segment to the A-frame ladder segments.
    Type: Grant
    Filed: October 17, 2001
    Date of Patent: August 12, 2003
    Inventor: John B. Walden
  • Extendable a-frame ladder for uneven surfaces
    Publication number: 20020053488
    Abstract: The invention is an improvement to an A-frame ladder, adding to an A-frame ladder independent extension means allowing the ladder to be placed on uneven surfaces, stairs or level surfaces in a stable and level configuration, the improvement adding a sliding ladder segment attached to the A-frame ladder segments, locking bars on the sliding ladder segments spaced apart along the sliding ladder segments, sliding bracket mounts attaching each sliding ladder segment to the A-frame ladder segments, and pivoting spring-loaded locking catches securing the sliding ladder segment to the A-frame ladder segments.
    Type: Application
    Filed: October 17, 2001
    Publication date: May 9, 2002
    Inventor: John B. Walden