Patents by Inventor Johannes F. Niedworok

Johannes F. Niedworok 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).

  • Patent number: 4434871
    Abstract: The present invention entails an emergency escape ladder that can be used to descend from one level of a building downwardly to another level, after which the ladder may be repeatedly repositioned for descending on downwardly in a like manner. Functionally the emergency escape ladder includes a plurality of treads interconnected by a pair of flexible tie lines in the form of chains. Because of the flexible chains, the emergency escape ladder may assume an inoperative position where the same can be folded and stored in a compact area. Further, the emergency escape ladder is provided with a plurality of stabilizing bars that are secured together in end-to-end relationship, with said treads sandwiched therebetween. When the stabilizing bars are interconnected between treads, the ladder assumes an operative mode or position where the same is elongated and generally rigid.
    Type: Grant
    Filed: March 3, 1983
    Date of Patent: March 6, 1984
    Inventor: Johannes F. Niedworok
  • Patent number: D296108
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: June 7, 1988
    Inventor: Johannes F. Niedworok