Patent ID: 8196231

Claim:
A toilet which includes a toilet bowl, a trapway with an upper trap that connects to said toilet bowl and a lower trap that connects to a drain and a trapway passage that extends between said traps, a tank, a water supply in said tank that flows water into said toilet bowl in each flushing, and a source of pressured air coupled to said trapway passage to establish a positive air pressure that is at a pressure on the order of magnitude of 1.5 centimeters of water above atmospheric pressure, in said trapway passage prior to a flushing, said trapway passage and a conduit that extends from said source to said trapway passage having a combined volume on the order of magnitude of 750 ml, prior to a flushing, wherein: said source of pressured air is constructed to supply pressured air at a pressure on the order of magnitude of 1.5 centimeters of water above atmospheric pressure that fills said trapway passage and conduit, and to store an additional volume of said pressured air equal to at least 30% of the volume of said trapway passage and conduit prior to each flushing, to thereby maintain a positive trapway passage air pressure prior to a flushing despite a slight change in water volume in said traps.