US PATENT SUBCLASS 60 / 312
.~ Pulsed, timed, tuned or resonating exhaust


Current as of: June, 1999
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60 /   HD   POWER PLANTS

272  DF  INTERNAL COMBUSTION ENGINE WITH TREATMENT OR HANDLING OF EXHAUST GAS {18}
312.~ Pulsed, timed, tuned or resonating exhaust {2}
313  DF  .~.~> Correlated exhausts from plural cylinders
314  DF  .~.~> Two-cycle engine


DEFINITION

Classification: 60/312

(under subclass 272) Apparatus correlating, or correlated

with the pressure waves or pulses produced by the regular, intermittent discharge from an engine's exhaust port or ports.

SEE OR SEARCH CLASS

181, Acoustics,

277+, for a muffler, per se, tuned to silence or muffle pressure pulses.