US PATENT SUBCLASS 137 / 148
.~.~.~ Piston
Current as of:
June, 1999
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137 /
HD
FLUID HANDLING
123
DF
SIPHONS
{8}
142
DF
.~ With flow starting, stopping or maintaining means {7}
147
DF
.~.~ Pump or liquid displacement device for flow passage {2}
148
.~.~.~ Piston {1}
149
DF
.~.~.~.~
> Co-axial within flow passage
DEFINITION
Classification: 137/148
(under subclass 147) Apparatus in which the pump includes a piston.
SEE OR SEARCH CLASS
4, Baths, Closets, Sinks, and Spittoons,
373, for water closet flushing tanks having a siphon outlet which is started by a piston or its equivalent.