US PATENT SUBCLASS 236 / 26 R
.~ Pressure-operated

Current as of: June, 1999
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236 /   HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

20 R  DF  CLOSED FLUID HEATERS {8}
26 R.~ Pressure-operated {11}
27  DF  .~.~> With balancing pressure chamber
28  DF  .~.~> Stroke retarding
29  DF  .~.~> Relay, puppet
30  DF  .~.~> Bourdon type
31  DF  .~.~> Float
26 A  DF  .~.~> Gas burner controls
26 B  DF  .~.~> Pressure responsive means controls draft
26 C  DF  .~.~> Pressure responsive elements per se
26 D  DF  .~.~> Pressure responsive means controls forced draft
26 E  DF  .~.~> Pressure responsive means controls oil burner
26 F  DF  .~.~> Pressure responsive means controls fluid coupling

Unofficial Alpha Subclasses: R A B C D E F

DEFINITION

Classification: 236/26

(under subclass 20) Devices not otherwise classifiable controlling the heating of the closed fluid-heater according to the pressure in the heater.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8, 14, 17, and 85, for other pressure operated controls.