Patents by Inventor Bengt Heimer Andersson

Bengt Heimer Andersson 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 ladder
    Patent number: 4119177
    Abstract: A collapsible ladder consisting of a plurality of telescoping upright sections in which the uppermost rung of each section is fixedly mounted in the uprights, and in which the uprights of one or more upper sections are provided with longitudinal guideways in which end portions of at least the lowermost one of the rungs of the section are displaceable.
    Type: Grant
    Filed: November 10, 1977
    Date of Patent: October 10, 1978
    Inventor: Bengt Heimer Andersson