Patent ID: 7866334

Claim:
A sewer venting apparatus for use in venting sewer gases out of and into a sewer pipe adapted to carry liquid sewage and comprising: (a) a sewer vent valve mechanism having an input communicating with a sewer pipe and an output, said valve mechanism enabling outflow of the sewer gases from said sewer pipe and inflow of air from the atmosphere into said sewer pipe while preventing outflow of the liquid sewage through said vent valve mechanism; (b) a conduit in communication with said vent valve output; (c) a one-way inlet check valve in flow communication with said conduit to enable flow of air into the conduit; (d) a gas filter unit communicating downstream of both of said output of said valve mechanism and said conduit, and configured and oriented to filter substantially all the sewer gases outflowing from said conduit through said filter comprising a filter medium canister for removing offensive odors from the sewer gases; (e) a vent stem in flow communication with said filter unit; and (f) a one-way outlet check valve in flow communication with said vent stem and enabling outflow of gas from said vent valve mechanism into the atmosphere, and wherein substantially all the air flowing through the one-way inlet check valve bypasses the gas filter unit and substantially all the sewer gases flowing through the one-way outlet check valve passes through the gas filter unit.