Resources Contact Us Home

Image Number 3 for United States Patent #4463951.

The invention provides a ball for a game having a spherical soft polyurethane foam and a surface layer of foamed polyvinyl chloride formed on the surface of the spherical body. The ball is produced by first casting the surface layer in a mold to form a hollow foamed PVC body having closed cells, and then charging a foamed polyurethane composition into the hollow thus formed, to produce a sphere of polyurethane having open cells within the surface layer. Also provided is a ball for games having a spherical body of foamed polyvinyl chloride and having a spherical cavity at the center. The ball is safe, has proper flexibility, and is not subject to punctures.

  Recently Added Patents
Transmission device
Aluminum galvanic cell
Polymer-encapsulated colorant nanoparticles
Data storage apparatus, memory control apparatus and method for controlling flash memories
Metal halide lamps with fast run-up and methods of operating the same
Fuser member
  Randomly Featured Patents
Heated bucket system
Semiconductor inner lead bonding tool
Ancillary process outputs of a vortex flowmeter
Bonding unit for reinforced concrete structural components
Display device with oriented liquid crystals
Printed circuit card hybrid
Herbicidal mixtures
Bezel assembly for computer
Electrolytic anode
Bottle transfer assembly