Patents by Inventor Bernard J. Kupfert

Bernard J. Kupfert 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).

  • Apparatus for rotatably positioning a ladder within a stairway
    Patent number: 4846305
    Abstract: An apparatus 10 provides easy, stable positioning of a ladder within a stairwell. The apparatus 10 includes multiple base portions 14, 24 which traverse and rest upon multiple steps 20, 28. Sidewall braces 38, 40 adjustably engage the stairwell sidewalls to inhibit lateral movement of the base portions 14, 24. A bracket 52 is pivotally connected to the base of the ladder and rotatably connected to the base portions 24. Accordingly, the ladder is free to be manually rotated and pivoted to rest against any of the walls forming the stairwell.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: July 11, 1989
    Inventor: Bernard J. Kupfert