BALL (VERSIONS) Russian patent published in 1997 - IPC

FIELD: sports, in particular, tennis balls. SUBSTANCE: ball has enclosure and turbulizer positioned on outer surface of enclosure. Turbulizer has at least two rows of channels, with channels of one row being positioned at an angle to channels of other row. Channels in a row may be positioned in parallel one with respect to another. Cavities of channels of different rows may be communicated. Ball may be made hollow inflated, hollow noninflated or continuous. EFFECT: simplified construction, increased service life and enhanced entertaining effect. 26 cl, 12 dwg