Instructional baseball

Details Instructional baseball Instructional baseball

1997-09-26

1999-11-16

Wong, Steven

Games using tangible projectile

Projectile, per se; part thereof or accessory therefor

Having fluid-dynamic means other than stitched seam or...

A63B 3908

Patent

active

059848138

ABSTRACT:
An instructional baseball for teaching the proper manner of throwing a curveball. The instructional baseball comprises a generally spherical ball having a continuous seam on the surface, said seam defining a horseshoe-shaped boundary for each of four areas on the surface of the ball, and a depression within each of the areas, each of the depressions having substantially the same volume.

REFERENCES:
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patent: 5280906 (1994-01-01), Vitale
patent: 5472187 (1995-12-01), Kempf
patent: 5711725 (1998-01-01), Bengtson
Keese, Parton, "Breaking Pitches Made Easy," New York Times Apr. 17, 1978, p. C. 14.
Catalog advertisement featuring "Radar Ball," p. 93; Sep., 1997.

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