US PATENT SUBCLASS 137 / 79
.~.~ Temperature


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

78.1  DF  AMBIENT CONDITION CHANGE RESPONSIVE {4}
78.5  DF  .~ Atmospheric {2}
79.~.~ Temperature {1}
80  DF  .~.~.~> With additional diverse control


DEFINITION

Classification: 137/79

(under subclass 78.5) Apparatus which controls a fluid flow

in response to variations of temperature in the surrounding atmosphere.

(1) Note. This subclass includes apparatus which sense the presence of a fire in the atmosphere and exercise a control in response thereto.

SEE OR SEARCH THIS CLASS, SUBCLASS:

59+, for freeze condition responsive safety devices.

67+, for systems controlled by a heat destructible or fusible means.

468, for thermally responsive valves responding to line condition change, and see the search notes thereto. SEE OR SEARCH CLASS

169, Fire Extinguishers,

56+, for fire extinguishers including valves responsive to the occurrence of fire conditions.