This class relates only to automatic temperature and humidity regulation, and is not to include the system where the thermostatic control constitutes but an element of the system, even though the system includes temperature regulation, such, for example, as refrigeration, where the refrigerating structure or method is claimed. Systems are also excluded where the specific burner structure, specific boiler structure, specific heat-exchange element, specific fire extinguishing structure, specific heat distributing system, specific internal-combustion engine structure, specific furnace structure, specific gas producer structure or method, specific heating and molding devices, etc., are claimed--that is, this class is confined to automatically operating temperature or humidity controlling mechanism, but excludes all patents to the specific mechanism controlled, even though the thermostat is claimed, either broadly or specifically, in combination therewith.
(1) Note. This class includes only patents for devices which control temperature or humidity automatically, but not those which are merely operated by temperature variation. The only apparent exceptions are the heating radiator thermostatic air relief valves, the thermostatic steam traps and thermostatically operated regulating valves.
(2) Note. This class provides for all heating radiator automatic air relief valves including a thermostat.
(3) Note. This class provides for all automatic steam traps including a thermostat in the combination.
(4) Note. Patents for devices for controlling the flow of air over an automobile radiator by means of a thermostat located either in the cooling water or under the hood are classified in this class unless some novelty in the engine or
cooling system is claimed.
REFERENCES TO OTHER CLASSES
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids, 524+, for automatic control of such apparatus, including temperature and humidity regulation for such specific apparatus.
62, Refrigeration,
132+, for automatically controlled apparatus specialized to refrigeration.
65, Glass Manufacturing,
162, for temperature or heater control responsive to a condition sensing means combined with glassworking or treating apparatus.
73, Measuring and Testing,
29.02+, for hygrometers and hygrostats.
116, Signals and Indicators,
101+, for thermostatically controlled nonelectric alarms.
122, Liquid Heaters and Vaporizers,
451.1+, for devices for automatically controlling the feed water to a boiler by means of a thermostat and according to the level of the water in the boiler, 504.1 and 504.3 for fusible plugs where a pressure is released on the plug fusing at a certain temperature and 504.2 for devices where a thermostat operates on a fall of boiler water level to open a valve to sound an alarm.
123, Internal Combustion Engines, appropriate subclasses for devices for automatically controlling the flow (or supply) of air to the manifold of an internal-combustion engine according to the temperature of the engine or manifold. 131, Tobacco,
303, for processes and apparatus for treating tobacco with fluids combined with means for automatically regulating the temperature and/or humidity of the fluids.
137, Fluid Handling, appropriate subclass for fluid handling apparatus and processes not otherwise provided for, including automatic control of fluid flow in response to a change in a condition. Note particularly
59+, 72+, 79+, 457, and 468 for the control of flow in response to a change in thermal conditions.
165, Heat Exchange,
201+, for specific heating and cooling elements with automatic control, and subclasses 281+; 287+ for specific heat exchange elements with automatic temperature or pressure control or response.
169, Fire Extinguishers,
42, for fusible links of general application.
261, Gas and Liquid Contact Apparatus,
39, for fuel or air valves in carburetors thermostatically operated.
323, Electricity: Power Supply or Regulation Systems, 220, 354 for voltage or current regulators.
337, Electricity: Electrothermally or Thermally Actuated Switches,
298+, for thermostatic switches.
340, Communications: Electrical,
584+, for electrical alarms automatically responsive to temperature, and subclass 602 for electrical alarms automatically responsive to humidity.
374, Thermal Measuring and Testing,
100+, for a thermometer.
399, Electrophotography,
91+, for internal machine environment control of an electrophotos:graphic device.
431, Combustion,
18+, for (1) a residual specific burner with a timer, programmer, or condition responsive control; or (2) for a residual temperature modifying apparatus specialized to combustion having a nonspecific burner that is merely turned off and on by a conventional off and on thermostat sensing the temperature of the chamber or material being heated.