Patents by Inventor Markku Koivurova

Markku Koivurova 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).

  • Spring articulation structure
    Patent number: 6305674
    Abstract: A spring articulation structure particularly for play, fitness training and sports instruments, said structure comprising a core element (1) supported in between two rubber rings (2) and provided with a shaft element (5) fitted in said core element; a shell compactly surrounding the core element and the rubber rings and attached to a bottom plate (9), the top part (3′) of said shell being in the middle provided with a aperture (8) with a downwardly narrowing conical surface (7) for the shaft element (5); and a cylindrical element (4) resting on top of the top part (3′) of the shell and surrounding the shaft element (5).
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: October 23, 2001
    Assignee: Lappset Group Oy
    Inventor: Markku Koivurova