Patents by Inventor Carl Christianson

Carl Christianson 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).

  • Collapsible stepladder
    Patent number: 10435949
    Abstract: The collapsible stepladder is a climbing structure that allows a person to increase their vertical elevation. The collapsible stepladder comprises a plurality of support stiles, a telescopic stile, a plurality of telescopic handrails, a plurality of steps, a plurality of detents, and a plurality of assembly hardware. The plurality of support stiles and the plurality of steps form the stepladder portion of the collapsible stepladder. The telescopic stile and the plurality of telescopic handrails are safety devices associated with the collapsible stepladder. The vertical height of both the plurality of telescopic handrails and the telescopic stile are adjustable such that safety grips are available at a vertical height appropriate for the elevation. The plurality of detents and the plurality of assembly hardware are used to assemble the collapsible stepladder.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: October 8, 2019
    Inventors: Carl Christianson, Frances M. Barker
  • COLLAPSIBLE STEPLADDER
    Publication number: 20190128065
    Abstract: The collapsible stepladder is a climbing structure that allows a person to increase their vertical elevation. The collapsible stepladder comprises a plurality of support stiles, a telescopic stile, a plurality of telescopic handrails, a plurality of steps, a plurality of detents, and a plurality of assembly hardware. The plurality of support stiles and the plurality of steps form the stepladder portion of the collapsible stepladder. The telescopic stile and the plurality of telescopic handrails are safety devices associated with the collapsible stepladder. The vertical height of both the plurality of telescopic handrails and the telescopic stile are adjustable such that safety grips are available at a vertical height appropriate for the elevation. The plurality of detents and the plurality of assembly hardware are used to assemble the collapsible stepladder.
    Type: Application
    Filed: October 31, 2017
    Publication date: May 2, 2019
    Inventor: Carl Christianson