Patents Assigned to Cosima Zenkner
  • Stair construction element
    Patent number: 6067758
    Abstract: The invention concerns a stair construction element comprising a horizontal tread part and a nosing-like riser part extending vertically therefrom, for renovating a stair, in which a tread part (2) and a nosing-like riser part (3) form an integral element (1) encased or coated with laminate (4).
    Type: Grant
    Filed: December 16, 1997
    Date of Patent: May 30, 2000
    Assignee: Cosima Zenkner
    Inventor: Klaus Dieter Zenkner