Patents by Inventor Robert L. Ziolkowski

Robert L. Ziolkowski 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).

  • Ladder with bottom step indicator
    Patent number: 5954154
    Abstract: A new ladder with bottom step indicator for indicating to a user when the bottom step of the ladder has been stepped on. The inventive device includes a pair of spaced apart elongate rails each having upper and lower ends with a plurality of steps extending between the rails. A light source is attached to one of the steps and a switch is provided on another of the steps and is electrically coupled to the light source such that a user stepping on this step activates the light source.
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: September 21, 1999
    Inventor: Robert L. Ziolkowski