Patents by Inventor Joseph Grenko

Joseph Grenko 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: 5401040
    Abstract: A simplified roller skate with an improved assembly for quickly and efficiently adjusting the turning action of the skate. Front and rear wheel trucks comprising a single piece pedestal and tongue unit which are engaged in sockets formed within a main beam assembly, and are turned by selectively adjustable king pin assemblies. Further, structure for reversing the rear wheel truck is disclosed which reduces the stress and strain imposed on the skater's legs and ankles albeit with a reduction in turning capability.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: March 28, 1995
    Inventor: Joseph Grenko
  • Patent number: 4623159
    Abstract: An improved roller skate construction in which the front and rear shoe-receiving parts of the skate frame are carried respectively on front and rear wheeled axles through the medium of front and rear socket and pedestal structures. Each pedestal is received in its downwardly-opening socket in such fashion that the upper end of the pedestal supportingly engages the closed upper end of the socket to enable limited rocking between the axle and its associated frame part. Each socket and pedestal structure is supplemented by a rearwardly extending tongue on the front axle and a forwardly extending tongue on the rear axle, these being pivoted on the axes of the respective axles. Each tongue is connected to its associated support by a ball and socket joint whose axis is below the interengaging ends of the pedestal and pedestal socket, further augmenting and controlling the relative rocking between the axles and the frame as the skater accomplishes arcuate patterns, etc.
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: November 18, 1986
    Inventor: Joseph Grenko