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.