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
Method and apparatus for map transmission in wireless communication system
System and method for detecting crop rows in an agricultural field
System for programming domestic appliances and method for programming assembly-line programmable domestic appliances
Optical scanner and image-forming device
Method, apparatus, and manufacture for adaptation of video encoder tuning parameters
Circuitry testing module and circuitry testing device
Method of operating a split gate flash memory cell with coupling gate
  Randomly Featured Patents
Steering equipment for vehicles
Method and system for changing the size of edit controls on a graphical user interface
Rolling mills
Method and apparatus for contamination control in processing apparatus containing voltage driven electrode
Recording head design for identifying reader-to-permanent magnet isolation failure
Reversible thermosensitive recording material and method of use thereof
Erasable display medium
Display device
Method for delivering precursors