Patents by Inventor Peter W. Gronbeck

Peter W. Gronbeck 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: 4442920
    Abstract: A collapsible ladder which includes a plurality of platforms suspended from several rope segments. The rope segments are placed in open-ended notches disposed in the platforms and are clamped thereto by a plurality of clamp means, the clamp means being divided in half, each half engaging one notch and the rope therein and being clamped by an elongated fastener to the other half of the clamp means which engages another notch and the rope therein. As a result of this configuration, the elongated platforms, if damaged, can be changed individually without necessity of removal of other than the damaged platform.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: April 17, 1984
    Assignee: Steelstran Industries, Incorporated
    Inventors: Peter W. Gronbeck, Dennis Mullaney, Kimberly M. Smith