Manual of U.S. Patent Classification
as of June 30, 2000

Class
236
AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

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For search strategies, please refer to the Classification Index Explanation of Data web page.

Subclass		Title
ClassTitle		===> AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION
1R		MISCELLANEOUS
1A		. Burner controls not elsewhere classified in class
1B		. Zone control for heating and cooling medium
1C		. Heating and cooling controls
1D		. Stoker controls
1E		. Multistage controls
1EA		. . Multiple valve staging
1EB		. . Single valve staging
1F		. Piezoelectric crystal and other electric unit temperature controls
1G		. Heat conserving damper control
1H		. Burner controls with automatic cutoff
2		INCUBATOR TYPE OF HEATER
3		. Electric
		. Thermostatic
4		. . Expanding fluid
5		. . Expanding solid
6		BROODER TYPE OF HEATER
7		SADIRON TYPE
8		ATOMIZER TYPE OF BURNER
9R		COMBINED HEATER AND APARTMENT CONTROLLED
9A		. Combined heating and apartment control with heating medium circulation control
10		HOT-AIR FURNACE
11		. Air and fire control
12.1		MIXING FLUID OF DISSIMILAR TEMPERATURE
12.11		. Mixing valve with temperature motive means
12.12		. . Having electrical motive means
12.13		. Including bypass
12.14		. Fluid from only one supply is controlled
12.15		. Including separate relatively movable valve for each fluid supply
12.16		. Having oscillating or reciprocating valve
12.17		. . Valving member moves about an axis
12.18		. . . Tubular valve member
12.19		. . . Axially spaced flow control faces
12.2		. . Tubular valve member
12.21		. . Axially spaced flow control faces
12.22		. . . Seats face outwardly
12.23		. . Ports closed by valve action
13		. Plenum type
14		COMBINED BOILER AND FURNACE CONTROLLED
15R		FURNACE CONTROLLED
15A		. Domestic oven controls
15BR		. Commercial furnace controls
15BA		. . Solid fuel burning
15BB		. . Product and furnace temperature sensor
15BC		. . With conveyor thru furnace
15BD		. . Air and fuel control
15BE		. . Recuperator, gas turbine, melting furnace
15BF		. . Specialized furnace or heater, e.g., crystal growing
15BG		. . Timer or program
15C		. Furnace controlled responsive to pressure
15E		. Furnace controlled responsive to combustion products composition
16		COMBINED DRAFT AND CHECK CONTROL
		EXCHANGE HEATERS
17		. Pressure-operated
		. Thermostatic
18		. . Expanding fluid
19		. . Expanding solid
20R		CLOSED FLUID HEATERS
21R		. Safety cut-out
21B		. . Water heater control with excessive temperature cutoff
22		. Radiator type
		. Combined thermostat and flow controlled
23		. . One valve
24		. . Two or more valves
24.5		. Flow and pressure controlled
25R		. Flow controlled
25A		. . Flow responsive valve controlling fuel
26R		. Pressure-operated
27		. . With balancing pressure chamber
28		. . Stroke retarding
29		. . Relay, puppet
30		. . Bourdon type
31		. . Float
26A		. . Gas burner controls
26B		. . Pressure responsive means controls draft
26C		. . Pressure responsive elements per se
26D		. . Pressure responsive means controls forced draft
26E		. . Pressure responsive means controls oil burner
26F		. . Pressure responsive means controls fluid coupling
		. Thermostatic
32		. . Expanding fluid
33		. . Expanding solid
20A		. Top burner control
34		COOLING RADIATOR
34.5		. Bypass
35		. Air control
35.2		. . Shutters
35.3		. . . Servomotor
36		HEATING RADIATOR
37		. Combined radiator and apartment controlled
38		. Air control
		. Exhaust operated
		. . Fluid-operated motor
39		. . . Aspirator
40		. . Thermostatic
41		. . . With trap
		. Thermostatic
42		. . Expanding fluid
43		. . Expanding solid
44R		HUMIDITY CONTROL
44A		. Humidity control per se
44B		. With evaporator cooling spray
44C		. Humidity and temperature control
44E		. With electrical conductive element
45		DRAFT-OPERATED
46R		WITH TIMING ELEMENT
46A		. Diverse sensor
46B		. Stoker control
46C		. Controlled diverse means
46D		. Domestic oven
46E		. Hot air furnace
46F		. Timer other than clock
47		HIGH AND LOW TEMPERATURE ALTERNATE
48R		SNAP-ACTING
48A		. Including a permanent magnet
49.1		VENTILATOR TYPE
49.2		. Responsive to fire or smoke
49.3		. Electrically actuated
49.4		. Pneumatically actuated
49.5		. Mechanical linkage actuated
50		LIQUID VALVE
51		DISTANCE-ADJUSTED
52		FLOAT-OPERATED
		TRAPS
		. Float valve
53		. . Thermostatic air valve
		. Pressure-operated valve
54		. . Thermostatic pilot
		. Thermostatic
55		. . With float-controlled pilot
56		. . Expanding fluid
57		. . . Bourdon type
58		. . . Wafer type
59		. . Expanding solid
60		. . . Conduit
		AIR-RELIEF VALVES
		. Radiator type
		. . Thermostatic
61		. . . With pressure control
62		. . . With separate float
63		. . . Expanding float
64		. . . Expanding fluid
65		. . . . Float-operated
66		. . . Expanding solid
67		MOTORS
		. Relay
68R		. . Auxiliary heater
68A		. . . Heated expansible chamber vaporizer liquid injected by thermostat
68B		. . . Auxiliary heater applied to main temperature sensing means
68C		. . . Auxiliary heater applied to control device away from main temperature sensor
68D		. . . Thermo-controlled pilot burner operates a heat motor to actuate main fuel valve
69		. . Pyrometer galvanometer
70		. . . With beating element
71		. Balanced
72		. . Thermostatic relay
73		. Continuous drive
74R		. Electric
75		. . Reciprocating or oscillating
76		. . Step-by-step
77		. . Vibrating arm
78R		. . Relay
78A		. . . Plural control elements
78B		. . . Plural temperature sensors
78C		. . . Reversible motor
78D		. . . Proportional control
74A		. . Electric motor driven pump
		. Fluid-operated
79		. . Relay
80R		. . . Shunt
80A		. . . . Airplane
80B		. . . . Plural main valves
80C		. . . . Plural temperature sensors
80D		. . . . Pure fluid
80E		. . . . Plural pilots by single actuator
80F		. . . . Diaphragm biased open by line pressure
80G		. . . . Piston-type valve operator
81		. . . Snap-acting
82		. . . Compound
83		. . . . Snap-acting
84		. . . Electric
85		. . . Pressure-operated
		. . . Thermostatic
86		. . . . Expanding fluid
87		. . . . Expanding solid
88		. Magnetic release
89		. . Safety cut-out
90		. Thermal release
		THERMOSTATIC
91R		. Hot and cold
91A		. . Nonhabitable enclosure, e.g., incubator
91B		. . With oil burner
91C		. . With diverse sensor, e.g., humidity, pressure
91D		. . Heating and cooling
91E		. . Plural room or plural outside thermostat
91F		. . With at least one temperature sensor for temperature modifying media
91G		. . Current modifying sensor
92R		. With pressure control
92A		. . Combined with fuel gas pressure regulator
92B		. . Refrigeration expansion valves
92C		. . Pressure- and temperature-actuated relief valves
92D		. . Pressure- and temperature-actuated valves associated with carburetors
93R		. In fluid controlled
93A		. . Expanding fluid
93B		. . Shower heads
94		. With indicator or alarm
		. Flue or heater attached
95		. . Expanding fluid
96		. . Expanding solid
97		. Cooled element
98		. Fluid transmission
99R		. Expanding fluid
100		. . Float or piston operation
99A		. . Nontemperature sensor
99B		. . Nonvalving device
99C		. . External and internal sensors
99D		. . Heat shield
99E		. . Plural temperature sensors
99F		. . Pivoted valve
99G		. . Lever
99H		. . Liquid fuel feed
99K		. . Wax thermostat
99J		. . In flow line
101R		. Expanding solid
102		. . Concentric elements
103		. . Conduit
104		. . Fire pot
101A		. . Plural inlets or outlets
101B		. . Plural thermostats
101C		. . Thermostat with I.C.E.
101D		. . Coil thermostat
101E		. . Compound lever
		******************************
		DIGESTS
		******************************
DIG 1		Adjustable lever
DIG 2		Fail safe
DIG 3		Safety electric
DIG 4		Safety vacuum
DIG 5		Fusible
DIG 6		Clamp on
DIG 7		Coil bulb
DIG 8		Computer
DIG 9		Fan control
DIG 10		Filling
DIG 11		Expandible fluid
DIG 12		Heat conductor
DIG 13		Humidithermostat
DIG 14		Intermittant control
DIG 15		Photocell
DIG 16		Relief spring
DIG 17		Spring rate compensator
DIG 18		Rubber
DIG 19		Ventilated thermostat

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
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Last Modified: 6 October 2000