US PATENT SUBCLASS 473 / 613
.~ Having fluid-dynamic means other than stitched seam or textured surface to alter, stabilize, or retard passage of projectile through the fluid (e.g., spiral fluting to impart spin, etc.)

Current as of: June, 1999
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473 /   HD   GAMES USING TANGIBLE PROJECTILE

569  DF  PROJECTILE, PER SE; PART THEREOF OR ACCESSORY THEREFOR {28}
613.~ Having fluid-dynamic means other than stitched seam or textured surface to alter, stabilize, or retard passage of projectile through the fluid (e.g., spiral fluting to impart spin, etc.)

DEFINITION

Classification: 473/613

Having fluid-dynamic means other than stitched seam or textured surface to alter, stabilize, or retard passage of projectile through the fluid (e.g., spiral fluting to impart spin, etc.):

(under subclass 569) Subject matter wherein the projectile includes a means expressly disclosed as being intended to positively interact with the fluid through which the projectile is intended to travel for the purpose of changing or controlling its path of travel (including increasing or decreasing the length of that path) or for the purpose of increasing or maintaining the stability of the projectile during such travel (e.g., a projectile having spiral fluting to impart spin to the projectile in order to enhance its gyroscopic stability).

(1) Note. Although a stitched seam or textured surface disposed upon the surface of a projectile (e.g., the stitched seam on the surface of a baseball, etc.) may constitute a fluid-dynamic means to alter, stabilize, or retard the passage of the projectile through the fluid in which it is moving, projectiles having such stitched seam or textured surface are specifically excluded from this subclass.