Appeal No. 1998-0910
Application No. 08/454,596
The patent to Ushitora teaches a vacuum-type sewage
collecting apparatus (Fig. 4) wherein sewage from houses 30
passes under natural flow through underground pipes 31 to
underground cesspools 32 (transfer tank). When a
predetermined quantity of sewage accumulates in a cesspool, a
vacuum valve 33 opens so that sewage is sucked through a
suction pipe 34 and vacuum sewage pipe 1 under the influence
of suction generated by a vacuum pump 43 into an accumulating
tank 41 (holding tank).
The main pipes 1-1 of vacuum sewage pipe 1 extend downwardly
towards the accumulating tank and include downward-slope
portions 11 and lift portions 12 provided alternately to
exhibit a sawtooth-shaped configuration so that the
underground depth of the pipes does not become too deep. The
showing in Fig. 4 may be viewed as depicting a sewage
discharge pipe 1 rising to a point above the fluid level in
each of the cesspool and the accumulating tank.
The Oldfelt patent relates to a vacuum toilet system
(Fig. 1) and includes a discharge valve 6 for controlling flow
of material from a waste receiving bowl 2 to a holding tank 8
11
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