Class 237: HEATING SYSTEMS ( Manual of U.S. Patent Classification )

U.S. PATENT AND TRADEMARK OFFICE
Information Products Division

[Manual of Classification, Class Listing]

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

Class
237
HEATING SYSTEMS

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Subclass		Title
ClassTitle		===> HEATING SYSTEMS

1R		MISCELLANEOUS
1SL		. Special liquid
2R		AUTOMATIC CONTROL
3		. Brooder and incubator
4		. . Water
5		. Car
6		. . Steam
7		. Combined radiator and boiler
8R		. Water
8A		. . Automatic heating systems (water) with controls
8B		. . Heating systems with high temperature boiling liquids
8C		. . With boiler by-pass valve control
8D		. . Compact heating systems with controls
9R		. Steam
10		. . Gas displaced
9A		. . Automotive systems
9B		. . With direct contact between products of combustion and the liquid to be vaporized
11		. Compressed air
12		. Processes
2A		. Automatic heating systems with controls
2B		. Heat source is a reverse cycle refrigerating system or heat pump
12.1		HEAT AND POWER PLANTS
12.2		. Fire engine
12.3R		. Vehicle
12.3A		. . The heating is effected by circulated air
12.3B		. . The heating is effected by circulated hot water
12.3C		. . The heating system includes a combustion type heater
12.4		. Car
12.5		. . Smoke
12.6		. . Air
12.7		. . . Radiator
12.8		. . Steam
13		PLANTS
14		BROODER AND INCUBATOR
15		. Water
16		COMBINED RADIATOR AND BOILER
17		. Fluid fuel
18		. Solid fuel
19		COMBINED WITH WATER HEATER
28		VEHICLE
29		. Stove
30		. . Air casing
31		. . Depending
32		. Fluid fuel
33		. . Radiator
34		. Water
35		. . Car boiler
36		. . . Fluid fuel
37		. . . Train steam
38		. . . . Injected
39		. . Train steam
40		. Steam
41		. . Car boiler
42		. . . Train steam
43		. Heated floor
44		. Heat accumulator
45		. Encased radiator
69		HEATED FLOOR
46		VENTILATING
47		. Stove
48		. Furnace
49		. Enclosed radiator
50		AIR
52		. Stove
53		. Furnace
54		. Upper-room drum
55		. Flue heated
56		WATER
57		. Fluid fuel
58		. Steam
59		. Circulation
60		. . Geyser boiler
61		. . Auxiliary boiler
62		. . Boiler loop
63		. . Pump
64		. . . Steam displacing
65		. Pressure regulator
66		. Expansion tanks
67		STEAM
68		. Air discharge
70		HEAT RADIATORS
71		. Water, steam
72		. . Injected
73		. Steam
74		. . Circuit
75		. . Heat accumulator
76		. Ceramic
77		. Foot warmer
78R		. Air moistener
78A		. . Casing
78B		. . Radiator wick
78C		. . From radiator valve
79		. Shields
80		ANTIFREEZING DEVICES
81		PROCESSES
		******************************
		DIGEST
		******************************
DIG 1		Inert gas

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Questions regarding this report should be directed to:

U.S. Patent and Trademark Office
Information Products Division
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Washington, DC 20231
tel: (703) 306-2600
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email: oeip@uspto.gov

Last Modified: 6 October 2000

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

Class 237 HEATING SYSTEMS

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

Class
237
HEATING SYSTEMS