US PATENT SUBCLASS 473 / 609
.~ Having hollow, fluid-impervious shell, core, or bladder

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}
609.~ Having hollow, fluid-impervious shell, core, or bladder {1}
610  DF  .~.~> With sealable opening, valve, or inflation tube for insertion of fluid (e.g., beach ball, etc.)

DEFINITION

Classification: 473/609

Having hollow, fluid-impervious shell, core, or bladder:

(under subclass 569) Subject matter (a) comprising (1) a hard or tough enclosing layer either forming part of or constituting a projectile (shell), (2) a centrally disposed member intended to be overlaid by an enclosing outermost layer or envelope (core), or (3) a flexible and distensible bag, sack, or the like either forming part of or constituting a projectile (bladder); (b) which shell, core, or bladder contains a void greater than about ten percent of the total volume of the shell, core, or bladder; and (c) which shell, core, or bladder is substantially impervious to passage therethrough of a liquid or gas intended to occupy the void.