U.S. PATENT AND TRADEMARK OFFICE
Information Products Division |
U.S. Patent Classification System - Classification Definitions
as of June 30, 2000
Patents classified in a subclass may be accessed by either clicking on
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(definitions have been obtained from the
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is produced by the U.S. Patent and Trademark Office
Electronic Products Branch)
Class 236
AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION
Class Definition:
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, subclasses
524+ for automatic control of such apparatus, including
temperature and humidity regulation for such specific
apparatus.
62, Refrigeration, subclasses 132+ for automatically
controlled apparatus specialized to refrigeration.
65, Glass Manufacturing, subclass 162 for temperature or
heater control responsive to a condition sensing means
combined with glassworking or treating apparatus.
73, Measuring and Testing, subclass 29.02 for hygrometers
and hygrostats.
116, Signals and Indicators, subclasses 101+ for
thermostatically controlled nonelectric alarms.
122, Liquid Heaters and Vaporizers, subclass 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, subclass 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 subclasses 59+, 72+, 79+, 457,
and 468 for the control of flow in response to a change in
thermal conditions.
165, Heat Exchange, subclasses 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, subclass 42 for fusible links of
general application.
261, Gas and Liquid Contact Apparatus, subclass 39 for fuel
or air valves in carburetors thermostatically operated.
323, Electricity: Power Supply or Regulation Systems,
subclasses 220-354 for voltage or current regulators.
337, Electricity: Electrothermally or Thermally Actuated
Switches, subclasses 298+ for thermostatic switches.
340, Communications: Electrical, subclasses 584+ for
electrical alarms automatically responsive to temperature,
and subclass 602 for electrical alarms automatically
responsive to humidity.
374, Thermal Measuring and Testing, subclasses 100+ for a
thermometer.
399, Electrophotography, subclasses 91+ for internal
machine environment control of an electrophotos:graphic
device.
431, Combustion, subclasses 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.
SUBCLASSES
Subclass:
1
This subclass is indented under the class definition. Subject
matter not provided for in any of the following subclasses.
Subclass:
2
This subclass is indented under the class definition. Subject
matter for incubators.
SEE OR SEARCH CLASS:
119, Animal Husbandry, subclass 314, 317, 319, for such
devices having particular incubator structure.
237, Heating Systems, subclasses 3+ for the same with
specific heating systems.
Subclass:
3
This subclass is indented under subclass 2. Subject matter in
which the controlling means is electrically operated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 74+ for the type of operating apparatus used.
Subclass:
4
This subclass is indented under subclass 2. Subject matter in
which the regulating means is operated directly by a
thermostat of the expanding-fluid type.
Subclass:
5
This subclass is indented under subclass 2. Subject matter in
which the regulating means is operated directly by a
thermostat of the expanding solid type.
Subclass:
6
This subclass is indented under the class definition. Subject
matter for brooder type of heaters not otherwise
classifiable.
SEE OR SEARCH CLASS:
119, Animal Husbandry, subclass 306 for such devices having
particular brooder structure. See (1) note to that subclass
definition.
237, Heating Systems, subclasses 3+ for the same with
specific heating system.
Subclass:
7
This subclass is indented under the class definition. Subject
matter for self-heated sad-irons not otherwise classifiable.
SEE OR SEARCH CLASS:
38, Textiles: Ironing and Smoothing, subclasses 82+ for
such devices having particular iron structure.
219, Electric Heating, subclasses 490+ for heating systems
of general utility with automatic control means, and
appropriate subclasses for specific type electrical heating
devices with automatic current, voltage or temperature
control means.
Subclass:
8
This subclass is indented under the class definition. Devices
controlling the flow of steam or air and fuel to an atomizer
type of burner, according to changes in pressure or
temperature in the device heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 26+ for controlling devices responsive to
pressure changes in the closed fluid heater.
Subclass:
9
This subclass is indented under the class definition. Subject
matter which are operated by devices responsive to
temperature changes in a heater and also temperature changes
in an apartment to be heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
37 for control by radiator temperature and apartment
temperature.
91 for other controls responsive to temperatures at
different places.
Subclass:
10
This subclass is indented under the class definition. Subject
matter comprising hot air furnaces which are provided with
automatic temperature regulating means. In the devices of
this subclass the fire is generally regulated by the
temperature in the air space of the furnace.
Subclass:
11
This subclass is indented under subclass 10. Subject matter
in which the fire and also the flow of the heating air
through the air chamber of the furnace is controlled.
Subclass:
12.1
MIXING FLUID OF DISSIMILAR TEMPERATURE:
This subclass is indented under the class definition.
Apparatus mixing fluid from two or more different supplies in
which at least one of the supplies of the fluid is controlled
according to the temperature of the mixed fluid or the
temperature of one of the fluid supplies.
Subclass:
12.11
Mixing valve with temperature controlled motive means:
This subclass is indented under subclass 12.1. Apparatus
comprising flow control means positively moved to an adjusted
position by a motor means wherein the motor means is moved to
the adjusted position by a medium or force controlled by but
not resulting directly from a sensed temperature condition or
a change in such a condition.
(1) Note. Examples of motors to be found herein are
electric motors controlled by thermostatic switches, fluid
motors with independent sources of fluid pressure where a
thermal responsive valve senses a system conditions and
regulates fluid flow from said source to motor.
(2) Note. A valve merely moved by a heat motor which
directly senses a system condition and responds to move a
valve, e.g., bimetal, closed fluid system with sensing bulb,
etc., will not be found herein.
Subclass:
12.12
Having electrical motive means:
This subclass is indented under subclass 12.11. Apparatus
comprising a motor means responding to electrical energy
input for moving the flow control means.
Subclass:
12.13
Including bypass:
This subclass is indented under subclass 12.1. Apparatus in
which the device is provided with separate controllable
through passages, leading from a source of fluid, at least
one of the passages having a valving means permitting said
fluid to pass directly to a point of use, regardless of the
temperature existing in the system, and at least one other
passage being provided with means for controlling the flow of
said fluid in response to a temperature condition or a change
in temperature occurring at some point in the apparatus.
Subclass:
12.14
Fluid from only one supply is controlled:
This subclass is indented under subclass 12.1. Apparatus in
which the flow of only one of the supplies is controlled by
the sensed temperature condition of the mix.
Subclass:
12.15
Including separate relatively movable valve for each fluid
supply:
This subclass is indented under subclass 12.1. Apparatus
wherein the flow of each supply is controlled by a separate
flow control member movable in response to fluid
temperature.
(1) Note. Each member may be movable in response to the
temperature of either a respective fluid or a fluid mix.
Subclass:
12.16
Having oscillating or reciprocating valve:
This subclass is indented under subclass 12.1. Apparatus
wherein a flow control means moves in a prescribed straight
line or arcuate path of travel to control fluid flow.
Subclass:
12.17
Valving member moves about an axis:
This subclass is indented under subclass 12.16. Apparatus
wherein the flow control means comprises a flow control
portion movable in an arcuate path of travel.
Subclass:
12.18
Tubular valve member:
This subclass is indented under subclass 12.17. Apparatus
wherein the flow control means comprises a hollow sleeve or
cylinder like member or portion.
(1) Note. A cup shape flow control means is proper for
classification here if the sleeve or cylinder portion
performs a flow control function. Otherwise classification
will be based on other features.
Subclass:
12.19
Axially spaced flow faces:
This subclass is indented under subclass 12.17. Apparatus
wherein the flow control means comprises a member having a
seating face at each of its sides for coacting with seats on
oppositely disposed fluid inlets.
Subclass:
12.2
Tubular valve member:
This subclass is indented under subclass 12.16. Apparatus
wherein the flow control means comprises a hollow sleeve or
cylinder-like member or portion.
Subclass:
12.21
Axially spaced flow control faces:
This subclass is indented under subclass 12.16. Apparatus
wherein the flow control means comprises a movable valving
member having a seating face at each end for coacting with
seats on oppositely disposed fluid inlets.
Subclass:
12.22
Seats face outwardly:
This subclass is indented under subclass 12.21. Apparatus
wherein the seating faces on the member are directed away
from each other.
Subclass:
12.23
Ports closed by valve action:
This subclass is indented under subclass 12.16. Apparatus
wherein the movable flow control means moves to and from
contiguously along a surface having fluid ports therein for
controlling fluid passing therethrough.
Subclass:
13
This subclass is indented under subclass 12.1. Devices
controlling the mixing of warm and cold air in the plenum
type of heating systems according to the temperature of the
hot or cold air, mixed air, or apartment to be heated.
Subclass:
14
This subclass is indented under the class definition. Devices
controlling the fire under a boiler according to conditions
in the boiler and also according to conditions in the
furnace.
SEE OR SEARCH THIS CLASS, SUBCLASS:
15 for devices responsive to changes within the furnace.
subclasses 20+ for control devices operated by changes in
the boilers.
Subclass:
15
This subclass is indented under the class definition. Devices
controlling the fire according to conditions in the furnace.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14 for controls responsive to boiler and furnace.
95 96, for furnace control where the thermostat is attached
to the outside of the heater or flue.
104 for furnace controls operated by the expansion or
contractions of the furnace parts due to temperature
changes.
Subclass:
16
This subclass is indented under the class definition. Devices
controlling the draft damper and check damper of a stove or
furnace according to changes in the temperature of apartment
or element heated.
Subclass:
17
This subclass is indented under the class definition. Devices
controlling the supply of heating fluid to an exchange or
surface heater by the pressure of the fluid heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14 for the same combined with furnace control.
subclasses 26+ for pressure operated closed fluid heater
control.
85 for the control, per se.
Subclass:
18
This subclass is indented under the class definition. Devices
controlling the supply of heating fluid to an exchange or
surface heater directly by means of a thermostat of the
expanding fluid type responsive to the temperature of the
fluid heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4 42, 56+, 64, 95, and 99, for the type of thermostat used
and control devices operated thereby.
32 for closed fluid heaters with similar controls.
93 for devices where flow is regulated by the temperature of
the flowing fluid.
Subclass:
19
This subclass is indented under the class definition. Devices
controlling the supply of heating fluid to an exchange or
surface heater directly by means of a thermostat of the
expanding solid type responsive to the temperature of the
fluid heater.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5 43, 59+, 66, 96, and 101, for the type of thermostat used
and control devices operated thereby.
33 for closed fluid heaters with similar controls.
93 for devices where flow is regulated by the temperature of
the flowing fluid.
Subclass:
20
This subclass is indented under the class definition. Devices
controlling the temperature of the fluid heated.
Subclass:
21
This subclass is indented under subclass 20. Devices
controlling the heating means according to the conditions in
the heater, with additional means for cutting out the
regulating means under abnormal conditions, such as failure
of the regulator, (as by rupture of the diaphragm, for
example), the pressure exceeding a certain limit, the
water-level falling below a certain limit, the temperature
getting too high, or heating means failing.
(1) Note. The regulator must generally be repaired or reset
by hand.
SEE OR SEARCH THIS CLASS, SUBCLASS:
89 for magnetic trip release controls with cut-out
features.
SEE OR SEARCH CLASS:
137, Fluid Handling, subclasses 59+, 72+, 79+, 457, and 468
for thermally responsive valves in general.
Subclass:
22
This subclass is indented under subclass 20. Combined
radiators and heaters where the heater is controlled
according to the temperature of the radiator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 26+ for heaters controlled by the pressure in
the radiator.
32 33, for heaters controlled by a thermostat.
SEE OR SEARCH CLASS:
237, Heating Systems, subclass 7 for systems where the unit
is specifically claimed.
Subclass:
23
This subclass is indented under subclass 20. Devices in which
the heating means, usually a gas-burner, is controlled by the
combined action of a thermostat in the fluid heated and a
flow-motor operated by the flow of the fluid heated, the
thermostat and motor controlling the movement of a single
control-valve.
Subclass:
24
This subclass is indented under subclass 20. Devices in which
the heating means, usually a gas-burner, is controlled by the
combined action of a thermostat in the fluid heated and a
flow-motor operated by the flow of the fluid heated, the
thermostat and motor operating on separate valves.
Subclass:
24.5
This subclass is indented under subclass 20. Devices in which
the combined dynamic and static pressure of the fluid heated
controls the heating means, and those in which this combined
force is opposed by one of its elements alone or by a
different combination of them.
Subclass:
25
This subclass is indented under subclass 20. Devices in which
the heating means is controlled according to the rate of flow
of the fluid heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23 24, 24.5, and 45, for other temperature or humidity
regulators comprising flow control of the regulator.
SEE OR SEARCH CLASS:
137, Fluid Handling, subclasses 98+, 458 to 460, 486+, 496,
and 497+ for valves responsive to change in rate of flow.
Subclass:
26
This subclass is indented 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.
Subclass:
27
This subclass is indented under subclass 26. Devices where
the effect of the heater-pressure is counterbalanced by a
closed pressure-chamber.
Subclass:
28
This subclass is indented under subclass 26. Devices with
means for increasing the resistance to movement of a control
element as movement from normal increases.
Subclass:
29
This subclass is indented under subclass 26. Devices in which
at a given pressure a puppet-valve opens, allowing pressure
from the boiler to operate a motor, which actuates the
heat-controlling means.
Subclass:
30
This subclass is indented under subclass 26. Devices in which
the pressure-responsive element which operates the
controlling means is a Bourdon tube.
Subclass:
31
This subclass is indented under subclass 26. Devices in which
the pressure acts on a body of liquid, thereby varying the
level thereof, and a float or piston rising and falling with
the change in level of the liquid operates the controlling
means. Also includes devices where a float is raised more or
less by change in pressure of steam thereunder when water
boils.
SEE OR SEARCH THIS CLASS, SUBCLASS:
100 for other float responsive devices.
Subclass:
32
This subclass is indented under subclass 20. Devices
controlling the heating means directly by a thermostat of the
expanding-fluid type responsive to the temperature of the
fluid heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4 42, 56+, 64, 86, 95, and 99, for the type of thermostat
used and devices operated thereby.
18 for similar structure in exchange heaters.
Subclass:
33
This subclass is indented under subclass 20. Devices
controlling the heating means directly by a thermostat of the
expanding-solid type responsive to the temperature of the
fluid heated. The thermostat may be the walls of the
container.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5 19, 43, 59+, 66, 87, 96, and 101+, for the type of
thermostat used and devices operated thereby.
Subclass:
34
This subclass is indented under the class definition. Devices
not otherwise classified controlling the temperature of the
fluid within a cooling-radiator, as the radiator in the
cooling system of an internal-combustion engine.
SEE OR SEARCH CLASS:
123, Internal-Combustion Engines, subclass 41.02 for
specific cooling systems peculiar to internal-combustion
engines.
Subclass:
34.5
This subclass is indented under subclass 34. Subject matter
in which a by pass is interposed in the cooling circuit to by
pass the radiator, usually including a thermostatically
operated valve responsive to the temperature of the coolant
or engine and positioned in the circuit to direct the flow of
the coolant either to the radiator or the by pass.
Subclass:
35
This subclass is indented under subclass 34. Devices
controlling the flow of air over the radiator according to
the temperature of the fluid cooled or the cooling-air or the
engine temperature.
SEE OR SEARCH CLASS:
123, Internal-Combustion Engines, subclass 41.04 and 41.11+
for shutter and impeller controls associated with engine
cooling.
165, Heat Exchange, subclass 98 for radiator with means
controlling the flow of air therethrough not automatically
controlled, and subclasses 281+; 287+ for a heat exchanger
having automatic temperature or pressure control.
Subclass:
35.2
This subclass is indented under subclass 35. Subject matter
in which the means for controlling the air flow is shutters.
Subclass:
35.3
This subclass is indented under subclass 35. Subject matter
in which the means for operating the shutters includes a
servo-motor.
Subclass:
36
This subclass is indented under the class definition. Devices
not otherwise classified controlling the supply of heating
fluid to a heating-radiator.
Subclass:
37
This subclass is indented under subclass 36. Devices
responsive to conditions in the radiator and temperature of
the apartment heated thereby.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9 for systems in which the temperature of a heater and of
the apartment controls the regulation.
91 for controls responsive to temperatures at different
places.
Subclass:
38
This subclass is indented under subclass 36. Means regulating
the flow of air over the radiator according to temperature
changes in the radiator, the air heated, or the apartment to
be heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
13 for similar structure in fluid mixers.
Subclass:
39
This subclass is indented under subclass 36.
Heating-radiators with means for exhausting the air therefrom
in which the heating effect of the radiator is controlled by
a fluid-motor operated by said exhaust, the connection
between the exhaust and the motor being controlled by a
thermostat.
SEE OR SEARCH THIS CLASS, SUBCLASS:
54 for steam traps incorporating a pressure motor and a
thermostatic pilot therefor.
Subclass:
40
This subclass is indented under subclass 36.
Heating-radiators provided with a thermostat subjected to the
exhaust from the radiator and controlling the supply of
heating fluid to the radiator.
Subclass:
41
This subclass is indented under subclass 40. Subject matter
in combination with an automatic trap for discharging the air
and water of condensation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53 through 60, under "Traps", for the specific automatic
trap construction.
subclasses 53+ for steam traps with float valve and
thermostatically controlled air vent valve.
Subclass:
42
This subclass is indented under subclass 36.
Heating-radiators with a thermostat of the expanding-fluid
type for directly regulating the supply of heating fluid to
the radiator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4 18, 32, 56+, 64, 86, and 99, for the type of thermostat
used and controlling devices operated thereby.
subclasses 40+ for similar devices exhaust operated.
Subclass:
43
This subclass is indented under subclass 36.
Heating-radiators with a thermostat of the expanding solid
type for directly regulating the supply of heating fluid to
the radiator.
(1) Note. This also includes devices operated by the
expansion of the radiator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5 19, 33, 59+, 66, 87, 96, and 101+, for the type of
thermostat and controlling devices operated thereby.
Subclass:
44
This subclass is indented under the class definition. Devices
controlling the humidity of a room or apartment by means of a
device responsive to the relative humidity therein.
SEE OR SEARCH CLASS:
165, Heat Exchange, subclass 282 ; 283; 294; 296; and 297 for
a heating and cooling system having humidity control.
261, Gas and Liquid Contact Apparatus, subclasses 129+ for
temperature or humidity controlled gas liquid contactors
having heating or cooling means.
Subclass:
45
This subclass is indented under the class definition. Devices
controlling the operation of a heater according to the
draft.
SEE OR SEARCH CLASS:
137, Fluid Handling, subclasses 98+, 458 to 460, 486+, 496,
and 497+ for valves responsive to change in rate of flow.
Subclass:
46
This subclass is indented under the class definition. Devices
in which a clock is employed for adjusting the regulating
device at a given time or where the clock cuts in or cuts out
the regulating device; also devices with timing means for
periodically placing the regulating means into and out of
operation.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 192 for a refuse incinerator or
solid fuel furnace provided with a timer control.
Subclass:
47
This subclass is indented under the class definition. Devices
controlling the temperature by two different devices
alternately, one set to maintain the temperature relatively
high and the other relatively low.
SEE OR SEARCH THIS CLASS, SUBCLASS:
46 for clock controlled regulators that may be operated to
maintain different temperatures at different times.
Subclass:
48
This subclass is indented under the class definition. Devices
in which the temperature control valve does not move on
slight changes in temperature, but its operating force is
stored up during a certain movement of the temperature
responsive device, and then the valve (or controlling means)
suddenly moves throughout its entire movement not provided
for more specifically below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
81 83, for such devices incorporating a fluid motor which is
relay operated.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclass 100.1 for snap
action devices associated with mechanism for converting
reciprocating motion to or from oscillating motion.
Subclass:
49.1
VENTILATOR TYPE:
This subclass is indented under the class definition. Device
comprising particular temperature responsive means for
operating a device which controls air flow to, from, or
within a ventilated space.
(1) Note. Inclusion in this subclass requires specific
temperature sensing and coupled operating means structure
(i.e., a "means for controlling a ventilator in response to
temperature" is not sufficient to inclusion in this subclass
whereas a "bimetallic element operated actuating linkage for
a ventilator" is sufficient for inclusion).
(2) Note. The means usually detects and responds to air
temperature within the ventilated space or within an air
passage leading to the space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 2+ and the search notes thereunder, for a
similar control means associated with an incubator.
subclasses 44+ for a humidity response means for operating
a device which controls air flow to, from, or within a
ventilated space.
SEE OR SEARCH CLASS:
454, Ventilation, appropriate subclasses, for ventilator
structures, per se, and for ventilator operated by a nominal
temperature responsive control means for automatic
temperature regulation; note, in particular, subclass 370
for ventilation means with condition responsive control,
subclass 258 for an air distributing, moveable louver
responsive to temperature, and subclass 369 for an outlet
cowl having a spaced cap and a positively actuated valve with
a fusible release.
Subclass:
49.2
Responsive to fire or smoke:
This subclass is indented under subclass 49.1. Device wherein
the air flow control means is responsive to a sensing means
which detects a presence of (1) a flame due to combustion or
(2) a vaporous emission resulting from combustion.
SEE OR SEARCH CLASS:
169, Fire Extinguishers, appropriate subclasses, for a
specific fire extinguisher apparatus combined with a fire or
smoke responsive control means; see, in particular,
subclasses 56+ for such a condition responsive
fire-extinguisher for a special application.
454, Ventilation, subclass 257 for an inlet-ceiling-type air
diffuser having an emergency smoke or fire responsive valve,
subclass 342 for an outlet airway with an air pump and
specific emergency smoke handling structure, subclass 357 for
an outlet airway having an emergency smoke handling feature,
and subclass 369 for fire dampers which cut off ventilated
flow in response to elevated temperatures.
Subclass:
49.3
Electrically actuated:
This subclass is indented under subclass 49.1. Device wherein
the means operates the air flow control device by way of
electricity.
Subclass:
49.4
Pneumatically actuated:
This subclass is indented under subclass 49.1. Device wherein
the means operates the air flow control device by way of air
pressure.
Subclass:
49.5
Mechanical linkage actuated:
This subclass is indented under subclass 49.1. Device wherein
the means operates the air flow control device by way of a
system of interconnected machine elements.
Subclass:
50
This subclass is indented under the class definition. Devices
in which the regulating means controls the heating means by
means of a liquid valve.
Subclass:
51
This subclass is indented under the class definition. Devices
provided with means for adjusting from a distance the effect
of the regulating means.
Subclass:
52
This subclass is indented under the class definition. Devices
not otherwise classifiable which are operated by the rise and
fall of a float.
SEE OR SEARCH THIS CLASS, SUBCLASS:
31 for heaters controlled by pressure wherein the pressure
causes the rise and fall of liquid which motion operates a
float.
65 100, for regulators operated by expanding fluid and
incorporating a float moved by the fluid.
Subclass:
53
This subclass is indented under the class definition.
Automatic steam-traps in which the water-drain valve is
float-operated, but which are provided with a
thermostatically-controlled air-vent.
SEE OR SEARCH CLASS:
137, Fluid Handling, subclasses 171+ for steam traps in
which there is no thermally controlled air vent.
Subclass:
54
This subclass is indented under the class definition.
Automatic steam-traps with a pressure-motor for operating the
drain-valve and a thermostatically-operated pilot-valve for
controlling the action of the motive fluid on the
pressure-motor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
80 for the control in other combinations.
SEE OR SEARCH CLASS:
137, Fluid Handling, subclass 191 and 195 for steam traps
responsive to liquid level operated by float controlled servo
or pilot.
Subclass:
55
This subclass is indented under the class definition.
Automatic steam-traps with the drain-valve operated by a
thermostat and a float-controlled pilot-valve for controlling
the flow of heating fluid to the thermostat for operating the
same.
SEE OR SEARCH THIS CLASS, SUBCLASS:
68 for similar controls in other combinations.
Subclass:
56
This subclass is indented under the class definition.
Automatic steam-traps in which the drain-valve is directly
operated by a thermostat of the expanding-fluid type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
41 for radiator heat controls incorporating a similar
device.
64 for air relief valve of similar type.
Subclass:
57
This subclass is indented under subclass 56. Automatic
steam-traps in which the drain-valve is directly operated by
a thermostat of the expanding-fluid type in the shape of a
Bourdon tube.
Subclass:
58
This subclass is indented under subclass 56. Devices in which
the drain-valve is operated directly by an expanding-fluid
thermostat of the wafer type.
Subclass:
59
This subclass is indented under the class definition.
Automatic steam-traps in which the drain-valve is directly
operated by a thermostat of the expanding-solid type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
66 for air relief valve controlled by thermostat.
Subclass:
60
This subclass is indented under subclass 59. Devices in which
the drain-valve is directly operated by a thermostat of the
expanding-solid type, but which is in the shape of a conduit,
through which the heating fluid passes or is discharged.
SEE OR SEARCH THIS CLASS, SUBCLASS:
103 for controls operated by the expansions of a conduit.
Subclass:
61
This subclass is indented under the class definition. Air
relief-valves controlled by both thermostatic and
pressure-controlled means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
92 for controls with pressure and temperature responsive
means.
Subclass:
62
This subclass is indented under the class definition. Air
relief-valves controlled by both thermostatic and
float-controlled means, the float being distinct from the
thermostat.
Subclass:
63
This subclass is indented under the class definition. Air
relief-valves controlled by both thermostatic and
float-controlled means, the float being also the expanding
element.
Subclass:
64
This subclass is indented under the class definition. Air
relief-valves controlled by a thermostat only, the thermostat
being of the expanding-fluid type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 56+ for traps operated by expanding fluid
thermostats.
Subclass:
65
This subclass is indented under subclass 64. Subject matter
controlled by a thermostat only, the thermostat being of the
expanding-fluid type, the expanding fluid operating a float
or piston to operate the valve.
SEE OR SEARCH THIS CLASS, SUBCLASS:
100 for controls in which an expanding fluid operates a
float.
Subclass:
66
This subclass is indented under the class definition. Air
relief-valves controlled by a thermostat only, the thermostat
being of the expanding-solid type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53 59 and 62, for other applications of this control.
Subclass:
67
This subclass is indented under the class definition. Devices
which are operated by motors whose operation is controlled by
means responsive to the temperature to be regulated.
Subclass:
68
This subclass is indented under subclass 67. Devices in which
an expanding element is used to operate the controlling
means, the expanding element being heated (or cooled) by a
heater set into operation by means of a separate element
responsive to the temperature to be regulated.
SEE OR SEARCH CLASS:
60, Power Plants, subclasses 516+ for the expanding element
and heater alone or where the heater is not set into
operation by a heat responsive element.
251, Valves and Valve Actuation, subclass 11 for heat motor
operated valves in general.
Subclass:
69
This subclass is indented under subclass 67. Devices operated
by motors which are controlled by a relay consisting of a
galvanometer operated by the current generated in a
thermocouple responsive to the temperature to be regulated.
SEE OR SEARCH CLASS:
323, Electricity: Power Supply or Regulation Systems,
subclasses 234-298 for output responsive regulators.
Subclass:
70
This subclass is indented under subclass 69. Devices in which
an additional beating element is used to press the pointer of
the galvanometer onto the controlling-contacts at regular
predetermined intervals.
Subclass:
71
This subclass is indented under subclass 67. Devices operated
by a balanced motor in which changes in temperature destroy
the balance of the motor, and thus operate the regulating
means.
Subclass:
72
This subclass is indented under subclass 71. Devices in which
changes in temperature destroy the balance of the motor by
means of a thermostatically-operated relay.
Subclass:
73
This subclass is indented under subclass 67. Devices operated
by a continuously-driven motor normally disconnected from the
regulating means, but placed in operative connection
therewith by means responsive to the temperature to be
controlled.
Subclass:
74
This subclass is indented under subclass 67. Devices not
otherwise classifiable which are operated by electric motors
whose operation is controlled by means responsive to the
temperature to be regulated.
SEE OR SEARCH CLASS:
388, Electricity: Motor Control Systems, Art Collection 934
for running-speed control systems with feedback responsive to
a thermal condition.
Subclass:
75
This subclass is indented under subclass 74. Devices of the
type where the regulating member is operated by an element
reciprocated or oscillated by means of a solenoid or electric
magnet whose operation is controlled by means responsive to
the temperature to be regulated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
84 for similar controls which constitute relays for the
control of a fluid pressure motor.
SEE OR SEARCH CLASS:
310, Electrical Generator or Motor Structure, subclasses 15+
for reciprocating electric motor structure, and subclasses
36+ for oscillating electric motor structure.
318, Electricity: Motive Power Systems, subclasses 119+
for reciprocating or oscillating electric motor systems.
Subclass:
76
This subclass is indented under subclass 74. Devices which do
not operate the controlling means to the limits at a single
operation, but give step-by-step action.
Subclass:
77
This subclass is indented under subclass 74. Devices in which
the control element is operated by means of a vibrator and
circuit-make-and-break device.
Subclass:
78
This subclass is indented under subclass 74. Devices the
motors being set into operation by a relay, which is in turn
controlled by means responsive to the temperature to be
controlled.
Subclass:
79
This subclass is indented under subclass 67. Devices operated
by fluid pressure and controlled by a relay, which is in turn
controlled by means responsive to the temperature to be
regulated.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 185 for refuse incinerators and
solid fuel furnaces provided with control means responsive to
a sensed condition.
137, Fluid Handling, subclasses 82+ for fluid pressure
relays or followers, per se.
Subclass:
80
This subclass is indented under subclass 79. Devices in which
the fluid for operating the motor is shunted from the fluid
controlled.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39 54, 68, for other controls which employ the fluid of the
system regulated to motivate the control.
SEE OR SEARCH CLASS:
137, Fluid Handling, subclasses 485+ for the type of motors
in pressure responsive regulators.
Subclass:
81
This subclass is indented under subclass 79. Devices in which
the relay does not operate on slight changes in temperature,
but its operating force is stored up during a certain
movement of the temperature-responsive device and then
suddenly moves through its entire movement.
SEE OR SEARCH THIS CLASS, SUBCLASS:
48 for snap acting controls not a fluid operated relay.
83 for the same in a compound relay system.
Subclass:
82
This subclass is indented under subclass 79. Devices wherein
the fluid-motor controlled by a relay is controlled by
another relay, which is in turn controlled by the means
responsive to the temperature to be regulated.
Subclass:
83
This subclass is indented under subclass 82. Devices the
first relay being of the type which does not operate on
slight movements in the second relay, but the operating force
is stored up during a certain movement of the second relay
and then suddenly the first moves through its entire
movement.
SEE OR SEARCH THIS CLASS, SUBCLASS:
48 81, for other snap acting controls.
Subclass:
84
This subclass is indented under subclass 79. Devices wherein
the fluid-operated motor is controlled by an
electrically-operated relay-valve, which is in turn
controlled by the means responsive to the temperature to be
regulated. The electric device must actually operate the
relay-valve at least in one direction.
SEE OR SEARCH THIS CLASS, SUBCLASS:
79 for means where power for operating the relay-valve is
stored up by action of the motor and this is released by
electric means.
Subclass:
85
This subclass is indented under subclass 79. Devices wherein
the relay is operated by a device responsive to changes in
pressure in the fluid to be regulated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
29 for devices where the pressure controlled operates
directly on the valve which controls its flow to the motor.
subclasses 82+ for similar devices including compound
controls.
Subclass:
86
This subclass is indented under subclass 79. Devices wherein
the means responsive to the temperature is a thermostat of
the expanding-fluid type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39 for similar controls in heating radiator.
Subclass:
87
This subclass is indented under subclass 79. Devices wherein
the means responsive to the temperature is a thermostat of
the expanding-solid type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39 80, 81, and 82+, for similar responsive means in other
controls.
Subclass:
88
This subclass is indented under subclass 67. Devices wherein
the motor is a spring or weight motor which is released by
magnetic means controlled by the means responsive to the
temperature to be regulated.
Subclass:
89
This subclass is indented under subclass 88. Devices which is
provided with means for opening the circuit through the
magnetic means when the motor is run down.
Subclass:
90
This subclass is indented under subclass 67. Devices wherein
the motor is a spring or weight motor which is released by
the thermostat responsive to the temperature to be
controlled.
Subclass:
91
This subclass is indented under the class definition. Devices
operated by a plurality of thermostats, one or more in a
location at low temperature (as the outside of a building)
and the others at a relatively high temperature, (as the
inside of a building).
SEE OR SEARCH THIS CLASS, SUBCLASS:
9 14, 37, and 47, for systems which are controlled by
temperature at plural places.
44 for opposed thermostats.
SEE OR SEARCH CLASS:
165, Heat Exchange, subclass 257 for a selective heating or
cooling arrangement controlled by room and ambient
temperature sensors.
Subclass:
92
This subclass is indented under the class definition. Devices
operated by a thermostat and pressure-responsive means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
61 for radiator air relief means controlled by thermostat
and pressure.
Subclass:
93
This subclass is indented under the class definition. Devices
operated by a thermostat located in the fluid controlled, so
that its flow is controlled by its own temperature.
SEE OR SEARCH THIS CLASS, SUBCLASS:
55 through 60, for trap responsive controls.
61 through 66, for radiator responsive controls.
SEE OR SEARCH CLASS:
188, Brakes, subclasses 277+ for a fluid- resistance brake
having a thermostatic valve to regulate resistance.
Subclass:
94
This subclass is indented under the class definition. Devices
thermostatically operated, with an indicator or alarm to
indicate the operation or failure to operate.
Subclass:
95
This subclass is indented under the class definition. Devices
controlled by a thermostat of the expanding-fluid type,
attached to the outside of the heater or flue controlled and
responsive to the temperature thereof.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4 18, 32, 40+, 42, 56, and 99, for the type of thermostat
with a controlling device operated thereby.
Subclass:
96
This subclass is indented under the class definition. Devices
controlled by a thermostat of the expanding-solid type
attached to the outside of the heater or flue controlled and
responsive to the temperature thereof.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5 19, 33, 43, 59, and 87, for the type of thermostat with a
controlling means operated thereby.
Subclass:
97
This subclass is indented under the class definition. Devices
operated by a thermostat one element of which is provided
with means for cooling it or keeping it cool, so as to
increase the sensitiveness of the device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
91 for plural controls of different temperature.
Subclass:
98
This subclass is indented under the class definition. Devices
operated by a thermostat in which a fluid is used to transmit
the movement of the thermostatic element to the element
controlled.
SEE OR SEARCH THIS CLASS, SUBCLASS:
31 for systems wherein the fluid is transmitted to a float.
Subclass:
99
This subclass is indented under the class definition. Devices
in which the regulating means is operated directly by a
thermostat of the expanding-fluid type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4 18, 32, 40+, 42, 56+, 64, 68, 86, and 95, for certain
regulator systems incorporating such a thermostat.
Subclass:
100
This subclass is indented under subclass 99. Devices where
the motion of the expanding fluid is transmitted by a float
or piston operated thereby.
SEE OR SEARCH THIS CLASS, SUBCLASS:
31 65, for certain systems employing this type of control.
52 for a regulator employing a float not provided for in
this subclass or subclasses 31 and 65.
Subclass:
101
This subclass is indented under the class definition. Devices
in which the regulating means is operated directly by a
thermostat of the expanding-solid type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5 19, 33, 43, 59, 66, 87, 93, and 96, for certain regulator
systems employing this type of thermostat.
Subclass:
102
This subclass is indented under subclass 101. Devices in
which the thermostat of the expanding-solid type is made up
of two or more elements of different coefficients of
expansion, and in which these elements are concentrically
arranged. The coefficient of expansion of one element might
be zero.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23 24, and 33, for special combinations using this type of
thermostat.
Subclass:
103
This subclass is indented under subclass 101. Devices in
which the thermostat of the expanding-solid type is in the
shape of a tube through which the fluid to which the
thermostat is responsive flows.
SEE OR SEARCH THIS CLASS, SUBCLASS:
60 for air relief devices in which a conduit acts as part of
a thermostat.
Subclass:
104
This subclass is indented under subclass 101. Devices in
which the expansion and contraction of a fire-pot, or a
combustion-chamber wall of a heater is used to regulate the
heating effect thereof.
Information Products Division -- Contacts
Questions regarding this report should be directed to:
U.S. Patent and Trademark Office
Information Products Division
PK3- Suite 441
Washington, DC 20231
tel: (703) 306-2600
FAX: (703) 306-2737
email: oeip@uspto.gov
Last Modified: 6 October 2000