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US 4,991,844 AGranted
Apparatus for playing a ball game
OwnerDavid G. Derryinventor
Life of this patent
Estimating the term…
Abstract
Apparatus for playing a ball game, comprising a playing surface, a plurality of balls having an eccentric distribution of mass, and means for initiating rolling movement of the balls in a way which preserves the orientation of the eccentricity of mass distribution of the ball with respect to a rolling axis thereof.
Claims9
Apparatus for playing a ball, game, comprising:
- a playing surface,
- a plurality of balls having an eccentric distribution of mass, and
- means for initiating rolling movement of a selected one of said balls in a way which preserves the orientation of the eccentricity of mass distribution of said ball with respect to the rolling axis thereof, wherein said balls have a spherical outer surface and said eccentric mass distribution of said balls is produced by forming a generally radially extending cavity therein such that spherical outer surface of said ball to define a first axis joining the barycenter and the geometric center of said spherical outer surface, and further wherein one end of said axis defined by the straight line joining said geometric center of the spherical surface of a ball and said barycenter of the mass thereof is marked with an index detectable in one of a visual and tactile manner.
Dependencies are inferred from the claim text.