Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Ball










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
Positive electrode for secondary battery, and secondary battery
Optical splitter device
Block polymers and their process of preparation
Method and system for remote delivery of email
Pattern forming method using printing device and method of manufacturing liquid crystal display device using the same
Inhibitors of bacterial tyrosine kinase and uses thereof
Single-chain variable fragment (scFv) able to recognize and bind CD99 human protein
  Randomly Featured Patents
Tread for tire
4-Substituted-2-oxoazetidine compounds
Foldable toilet seat
Manufacturing process for a hollow pressure vessel made of AlZnMgCu alloy
Drive gear having an internal flexible coupling
Assembly for casting large curved shells of reinforced concrete
Electrolyte for a secondary cell
Tray attachment for a chair
Connector and a connector assembly
Navigational system for trip routing