US PATENT SUBCLASS 473 / 534
.~.~ With adjustable string-tensioning means

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

516  DF  PLAYER HELD AND POWERED, NONMECHANICAL PROJECTOR, PER SE, FOR PROJECTING AERIAL PROJECTILE BY STRIKING; PART THEREOF OR ACCESSORY THEREFOR {8}
524  DF  .~ Racket or paddle; accessory therefor (e.g., a tennis racket, tennis racket press, etc.) {19}
534.~.~ With adjustable string-tensioning means

DEFINITION

Classification: 473/534

With adjustable string-tensioning means:

(under subclass 524) Subject matter comprising a means combined with a racket, either by being incorporated in the racket or attached to the racket while it is being used during play, which means is adapted to variably apply a tensile force to one or more strings of the racket for the purpose of changing the tautness in the one or more strings.

(1) Note. A means for changing the tension of the one or more strings may include a means for expanding or contracting the surrounding peripheral supporting frame of the racket.

SEE OR SEARCH THIS CLASS, SUBCLASS:

556, and 557, for a stringing or string stretching device, either per se or combined with a racket, which device is adapted to be used with a racket while it is being strung or restrung, such device not being part of, or combined with, a racket while it is being used during play of a game.