Patents Assigned to Matrix Corporation
  • Patent number: 4199165
    Abstract: A skid accessory for skateboards adapted to be mounted at the end of the board between the wheel supporting trucks and the end of the board to protect the board from engagement with the ground and to act as a braking device by frictional engagement with the ground.
    Type: Grant
    Filed: July 21, 1978
    Date of Patent: April 22, 1980
    Assignee: Matrix Corporation
    Inventor: Arthur Spitzke
  • Patent number: 4159121
    Abstract: A grip accessory for skateboards, a pair of which are mounted on the top surface of the board to form foot or hand holds, each grip accessory being shaped generally like a mushroom with a stem and a head with the head spaced from the top surface of the skateboard to form an annular groove around the stem to receive the feet of a user of the board. The head also forms a hand rest for doing handstands.
    Type: Grant
    Filed: May 1, 1978
    Date of Patent: June 26, 1979
    Assignee: Matrix Corporation
    Inventor: Arthur Spitzke
  • Patent number: 4098478
    Abstract: A portable seat may be folded to a transport position by disposing the seat and support member in generally parallel relationship to each other and in a plurality of select positions longitudinally of each other, the entire seat assembly being suitable to transport by hanging from the belt or the like of a wearer. The seat is provided with a removable prong which pierces the ground to support the seat assembly when it is not occupied and also may be removed for the purpose of utilizing the seat on hard surfaces such as those encountered indoors.
    Type: Grant
    Filed: April 1, 1977
    Date of Patent: July 4, 1978
    Assignee: Matrix Corporation
    Inventor: Arthur Spitzke