US PATENT SUBCLASS 152 / 209.2
.~.~.~ For controlling noise by varying design cycle (e.g., specified pitch ratio, pitch sequence, etc.)

Current as of: June, 1999
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152 /   HD   RESILIENT TIRES AND WHEELS

151  DF  TIRES, RESILIENT {14}
208  DF  .~ Anti-skid devices {8}
209.1  DF  .~.~ Tread {13}
209.2.~.~.~ For controlling noise by varying design cycle (e.g., specified pitch ratio, pitch sequence, etc.) {1}
209.3  DF  .~.~.~.~> Having varying tread characteristic (e.g., groove depth, groove angle, etc.) other than design cycle

DEFINITION

Classification: 152/209.2

For controlling noise by varying design cycle (e.g., specified pitch ratio, pitch sequence, etc.):

(under subclass 209.1) Tread having at least two different pitches, for regulating noise generated when a tire surface contacts a road surface.