Patent ID: 7191868

Claim:
A silencer for silencing exhaust gases and for enabling the entrapment of burning carbon particles or sparks carried by the exhaust gases, comprising an exhaust gas inlet, an exhaust gas outlet, a first chamber, a first passage having first and second ends, and at least one acoustic resonator chamber, the first chamber and first passage being arranged such that exhaust gases passing from said exhaust gas inlet to said exhaust gas outlet pass from the first end of said first passage to the second end of said first passage and hence through said first chamber, wherein the second end of said first passage communicates with said first chamber without a substantial flow of exhaust gases into or out of the at least one acoustic resonator chamber, wherein the at least one acoustic resonator chamber is connected by a connecting passage to said first chamber, and wherein the second end of the first passage extends into the first chamber to a position proximate the connecting passage to permit entrapment of burning carbon particles or sparks carried in the exhaust gases.