(under subclass 200) Devices wherein the indicator is caused to move or is made visible by the motion or force of a liquid, gas, or vapor.
(1) Note. This subclass includes indicators that are moved directly by the fluid or indirectly by some effect resulting from the fluid movement.
(2) Note. The indicator does not have to be in the flow path.
(3) Note. The indication of arrival of a fluid at a point in a flow path is in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
112, for fluid flow alarms.
227, for liquid level indicators. SEE OR SEARCH CLASS
73, Measuring and Testing,
170.01+, for a device which determines fluid flow direction, in particular subclass 170.05 for fluid flow direction determination utilizing a fluid actuated alignment means, and subclasses 861+ for a volume or rate of flow meter.
220, Receptacles,
662+, and see the notes thereto, for structures wherein a transparent panel is mounted in a wall.
222, Dispensing,
40, for dispensers with signal indicator; and subclass 159 for dispensers with transparent flow rate section.
