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Practice baseball

  • US 4,286,783 A
  • Filed: 05/22/1980
  • Issued: 09/01/1981
  • Est. Priority Date: 10/25/1978
  • Status: Expired due to Term
First Claim
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1. A practice baseball adapted to be thrown by baseball pitchers, said baseball comprisinga. two distinct outer surfaces one of which comprises the major spherical portion of the surface of a sphere and the other surface has a shape other than that of said major spherical surface,b. the area of said major spherical portion being between 70% and 93% of the area of a sphere of the same major diameter,c. the annular part of the major spherical portion lying between (1) the juncture of the said major spherical portion and said other surface, and (2) a great circle parallel to said juncture, is large enough to accept at least one finger of the thrower'"'"'s hand when the ball is held in the ball gripping position required for throwing a conventional baseball as a straight ball,d. the weight of said practice baseball being between 11/4 and 7 ounces and the major diameter of said practice baseball being between 2 and 4 inches, ande. the relationship between the weight and diameter of said practice baseball being such that when the said practice baseball is thrown in the manner that a straight ball is thrown by baseball pitchers, it will curve to a controllable degree.

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