US PATENT SUBCLASS 237 / 65
.~ Pressure regulator

Current as of: June, 1999
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237 /   HD   HEATING SYSTEMS

56  DF  WATER {5}
65.~ Pressure regulator

DEFINITION

Classification: 237/65

(under subclass 56) Water heating-systems with means for regulating or varying the pressure on the circulating system.

SEE OR SEARCH CLASS

137, Fluid Handling,

455+, for line condition change responsive valves, particularly subclasses 505+ for fluid pressure regulators, per se.

236, Automatic Temperature and Humidity Regulation, appropriate subclasses.