US PATENT SUBCLASS 137 / 403
.~ By weight of accumulated fluid

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

386  DF  LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11}
403.~ By weight of accumulated fluid {4}
404  DF  .~.~> In sinking or bucket type float
405  DF  .~.~> Oil burner fuel overflow preventing safety cut-offs
406  DF  .~.~> In communicating measuring vessel {1}
408  DF  .~.~> In gravitating tank

DEFINITION

Classification: 137/403

(under subclass 386) Apparatus in which the liquid level is sensed by means responsive to the weight or pressure head of the accumulated liquid.

(1) Note. The receptacle which accumulates the pressure head to be sensed must be specifically related to the particular sensing means. A general statement that the sensing means is responsive or is merely connected to some receptacle, e.g., a tank, is insufficient basis for classification here.

SEE OR SEARCH THIS CLASS, SUBCLASS:

129, and 134, for weight or fluid operated devices associated with siphons.

161, 162+, 189+, and 204, for weight of fluid operated devices associated with diverse fluid containing pressure systems.

188+, for fluid separating traps with discriminating outlet for liquid controlled by weight or pressure of the accumulated liquid.

396, for apparatus controlling the outflow from a self-emptying tank by weight of accumulated liquid. 402, for gravitating tank as a supplemental or safety closing means or bias.

455+, for line pressure responsive valves not specifically related to a particular accumulating receptacle.

SEE OR SEARCH CLASS

177, Weighing Scales,

60+, for weigher responsive material control of general application.

222, Dispensing,

52+, especially subclasses 56-58 for similar arrangements in dispensers.

251, Valves and Valve Actuation,

12+, for fluid pressure actuated valves which are not condition responsive.

417, Pumps,

38, for a liquid pressure sensor for sensing liquid accumulation to control a pump drive motor.