US PATENT SUBCLASS 137 / 2
.~ With control of flow by a condition or characteristic of a fluid

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

1  DF  PROCESSES {5}
2.~ With control of flow by a condition or characteristic of a fluid {6}
3  DF  .~.~> Mixing of plural fluids of diverse characteristics or conditions {4}
8  DF  .~.~> For producing uniform flow
9  DF  .~.~> For producing proportionate flow
10  DF  .~.~> By speed of fluid
11  DF  .~.~> For regulating boiler feed water level
12  DF  .~.~> By fluid pressure

DEFINITION

Classification: 137/2

(under subclass 1) Processes in which one or more conditions or characteristics of a fluent material are determined and used to control the system in such a manner as to cause delivery of controlled quantities of a fluent material at a part of the system.

(1) Note. See the main class definition, for collected search notes on automatic fluid handling devices of this and related classes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

455+, for line condition change responsive valves, and see the search notes to subclass 455.