Conductive ball

A ball for use in court and ball game indicating systems comprising spaced electric ground leads forming part of a circuit intended to be closed by an impacting ball having conductive surface elements, such ball having requisite electric conductivity and high visibility in flight, comprising

• a. a flexible core ball with a diameter of 55-65 millimeters,
• b. a flexible, adhesive layer covering said core ball,
• c. a plurality of fibrous panels forming on their outside the playing surface of the ball cemented to the core ball by said adhesive layer,
• d. a seam between said panels, said seam having an electrically conductive surface, and
• e. a plurality of separate elements forming spaced electric leads on not more than 25% of the playing surface of said panels, said leads
• i. comprising a dark-colored electrically conductive substance,
• ii. having a defined shape and a width of at least 2 millimeters,
• iii. being spaced so that on the playing surface of the ball no lead is separated from the next nearest lead by more than 20 millimeters, and
• iv. extending to and contacting said conductive seam on the playing surface of the said panels
• so that said leads are electrically interconnected on the playing surface of the ball and so that two such leads touching the ground connect two electric ground leads at the moment of impact of the ball.

A ball for use in court and ball game indicating systems comprising spaced electric ground leads forming part of a circuit intended to be closed by an impacting ball having conductive surface elements, such ball having requisite electric conductivity and high visibility in flight, comprising

• a. a flexible core ball with a diameter of 55-65 millimeters,
• b. a flexible, electrically conductive, adhesive layer covering the core ball,
• c. a plurality of fibrous panels forming on their outside the playing surface of the ball cemented to the core ball by said adhesive layer,
• d. a seam between said panels, said seam having an electrically conductive surface, and
• e. a plurality of separate elements forming spaced electric leads on not more than 25% of the playing surface of said panels, said leads
• i. comprising a dark-colored, electrically conductive substance,
• ii. having a defined shape with a width of not less than 2 millimeters,
• iii. being spaced so that on the playing surface of the ball no lead is separated from the next nearest lead by more than 20 millimeters,
• iv. penetrating and being exposed on the inner surface of said panels,
• v. contacting the conductive layer cementing the core ball to said panels, and
• vi. extending to and contacting said conductive seam on the playing surface of said panels,
• so that the electric leads on the playing surface of the ball are electrically interconnected on said playing surface and between the inner surface of said panels and the core ball and so that two such leads on the ball surface touching the ground connect two electric ground leads at the moment of impact of the ball.

A ball for use in ball game indicating systems comprising spaced electric ground leads forming part of a circuit intended to be closed by an impacting ball have electrically conductive surface means, such ball having requisite electric conductivity and high visibility in flight, wherein

• a. at least 75% of the playing surface of the ball is light-colored, and
• b. electrically conductive means forming spaced electric leads have been provided on not more than 25% of the playing surface of the ball, said electric means
• i. comprising dark-colored, electrically conductive material,
• ii. having a defined shape and a width of at least 2 millimeters,
• iii. extending on essentially only the playing surface of the ball,
• iv. not being electrically connected substantially below the playing surface of the ball,
• v. being spaced so that on the playing surface of the ball no lead is separated from the next nearest lead by more than 20 millimeters, and
• vi. the electrically conductive means forming said leads having overall dimensions so that any one of said means on the playing surface of the ball will connect two ground leads upon contact of the partially flattened ball with the ground.