US PATENT SUBCLASS 473 / 152
.~.~.~ Sensor is projectile responsive (e.g., free-flight detection means, etc.)

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

131  DF  GOLF {23}
150  DF  .~ Projectile addressing surface and target, or distance marker (e.g., course, putting green with cup, driving range, miniature golf course, etc.) {7}
151  DF  .~.~ Electrical sensor or electrical indicator responsive to swingable implement or projectile {1}
152.~.~.~ Sensor is projectile responsive (e.g., free-flight detection means, etc.) {3}
153  DF  .~.~.~.~> Projectile in receiver indicator
154  DF  .~.~.~.~> Target impact responsive
155  DF  .~.~.~.~> Including sensor responsive to projectile on addressing surface or in flight (e.g., tee-target time detection, etc.) {1}

DEFINITION

Classification: 473/152

Sensor is projectile responsive (e.g., free-flight detection means, etc.):

(under subclass 151) Subject matter wherein the detection means is to detect a condition of the object to be struck by the player.