(under the class definition) Apparatus in which the pumping is effected by a body of liquid which is at least partially confined and forms a liquid piston to act as a pumping member, either the liquid piston or the means confining the liquid or both being set into motion, the inertia of the liquid piston (i.e., the tendency to remain in motion or at rest) or the momentum thereof being effective to produce the pumping action.
(1) Note. For a patent to be classified under this definition the pump must rely upon the inertia or momentum of the liquid for its operation. In many pumps such as a reciprocating piston, expansible chamber type the momentum of liquid being expelled from a chamber might incidentally also produce additional pumping action over that produced by the expansible chamber effect. However, such pumps are not included under this definition.
SEE OR SEARCH THIS CLASS, SUBCLASS:
104, for a momentum liquid piston used as a pumping means to pump a different fluid.
