.~ Pump chamber in constant communication with inlet or discharge conduit
DEFINITION
Classification: 417/557
(under subclass 437) Apparatus in which the pumping chamber is always in communication with the inlet or the discharge to or from said chamber during all phases of operation of the pump.
(1) Note. For classification under this definition the pump must be disclosed as of the type in which the inlet or exhaust are never completely closed under any condition of operation of the pump. However, the constantly open line may be throttled so long as it is not completely closed.
(2) Note. The subject matter in this subclass usually involves a restricted flow path either in the inlet or exhaust conduit which permits unimpeded flow in one direction, but restricts flow in a reverse direction.
