Patents by Inventor Louis Praprotnik

Louis Praprotnik 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: 4222376
    Abstract: An exercise machine for restoring lost movement to joints and muscles includes a base to which a chair upon which the user is seated may be mounted, to prevent the machine from tipping, and includes a vertical standard mounting a rotatable handlebar assembly and a crank assembly. The handlebar assembly includes a sloping stem rotatable on the vertical standard and handlebars rotatable on the upper sloping end of the stem, whereby propelling the handlebars about for a circular path of the stem upper end provides a wide range of movement to the arms and upper torso. The crank assembly is made up of upper and lower bicycle-type crank mechanisms, for the arms and legs, coupled by a V-belt so that strong, readily moved legs may be utilized to restore movement to arms whose range of movement is impaired, or vice-versa.
    Type: Grant
    Filed: September 6, 1979
    Date of Patent: September 16, 1980
    Inventor: Louis Praprotnik