US PATENT SUBCLASS 137 / 113
.~.~.~.~ Control by depletion of source

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

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
109  DF  .~ Self-controlled branched flow systems {4}
111  DF  .~.~ Plural inflows {2}
112  DF  .~.~.~ Alternate or successive inflows {1}
113.~.~.~.~ Control by depletion of source

DEFINITION

Classification: 137/113

(under subclass 112) Systems in which the control is in response to a failure or depletion of the source of the flow in one of the inflow.

(1) Note. Many of the patents in this subclass are drawn to bottled gas handling devices for substituting a second source of gas for the first when the pressure in the first drops below a satisfactory value.

SEE OR SEARCH CLASS

222, Dispensing,

6, for gas or vapor dispensing of this type.