Patents by Inventor Leroy R. Bartels

Leroy R. Bartels 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).

  • Independently mounted fall prevention apparatus
    Patent number: 4399890
    Abstract: A flexible cable safety system for a fixed ladder is mounted adjacent to and independent of the ladder. This arrangement is useful for ladders which are not designed to withstand the loads imposed when a safety system arrests the fall of a workman.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: August 23, 1983
    Assignee: International Telephone and Telegraph Corporation
    Inventors: Leroy R. Bartels, John H. Lawson, Paul L. King
  • Lightweight ladder
    Patent number: 4388983
    Abstract: A lightweight ladder includes a vertical member of flat sided tubing, rungs formed of angle metal, and ladder feet adapted to engage retaining clips mounted on a vertical structure. The ladder feed are designed to provide wedging between the clips and the vertical structure such that set screws are not required to keep the ladder in place and stable.
    Type: Grant
    Filed: January 25, 1982
    Date of Patent: June 21, 1983
    Assignee: International Telephone and Telegraph Corporation
    Inventors: Leroy R. Bartels, Arnold M. Milbright