US PATENT SUBCLASS 116 / 268
.~.~.~ Differential


Current as of: June, 1999
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116 /   HD   SIGNALS AND INDICATORS

200  DF  INDICATORS {32}
264  DF  .~ Fluid flow {4}
266  DF  .~.~ Pressure {6}
268.~.~.~ Differential


DEFINITION

Classification: 116/268

Differential:

(under subclass 266) Devices wherein the indicator is responsive to fluid forces that are not the same and the fluid forces are acting on the indicator at all times.

(1) Note. A fluid force that is applied to move an indicator in one direction and no fluid pressure to return it, or the same fluid pressure is directed to return the indicator in the opposite direction is not proper for this subclass.

(2) Note. An indicator which senses the pressure drop across a filter which is an indication of the flow and resistance to flow through the filter is proper for this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

70, for fluid pressure variation with an alarm.

269, for plural fluid pressure inputs with a single pressure applied.