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Class Information
Number: 237
Name: Heating systems >
Description: Apparatus and processes for heating rooms, chambers, houses, and other enclosing structures, including combinations of two or more heat generators and combinations of a heat generator with means for distributing a fluid heated thereby.

Class Number	Class Name	No. of Patents
237/50	Air	37
237/55	Flue heated	167
237/53	Furnace	49
237/52	Stove	21
237/54	Upper-room drum	4
237/80	Antifreezing devices	77
237/2R	Automatic control	25
237/2A	Automatic heating systems with controls	235
237/3	Brooder and incubator	37
237/4	Water	1
237/5	Car	22
237/6	Steam	7
237/7	Combined radiator and boiler	20
237/11	Compressed air	10
237/2B	Heat source is a reverse cycle refrigerating system or heat pump	374
237/12	Processes	12
237/9R	Steam	17
237/9A	Automotive systems	1
237/10	Gas displaced	0
237/9B	With direct contact between products of combustion and the liquid to be vaporized	2
237/8R	Water	223
237/8A	Automatic heating systems (water) with controls	61
237/8D	Compact heating systems with controls	6
237/8B	Heating systems with high temperature boiling liquids	3
237/8C	With boiler by-pass valve control	38
237/14	Brooder and incubator	18
237/15	Water	2
237/16	Combined radiator and boiler	32
237/17	Fluid fuel	9
237/18	Solid fuel	3
237/19	Combined with water heater	169
237/12.1	Heat and power plants	87
237/12.4	Car	2
237/12.6	Air	2
237/12.7	Radiator	2
237/12.5	Smoke	0
237/12.8	Steam	2
237/12.2	Fire engine	0
237/12.3R	Vehicle	209
237/12.3A	The heating is effected by circulated air	294
237/12.3B	The heating is effected by circulated hot water	444
237/12.3C	The heating system includes a combustion type heater	203
237/70	Heat radiators	54
237/78R	Air moistener	22
237/78A	Casing	6
237/78C	From radiator valve	0
237/78B	Radiator wick	3
237/76	Ceramic	1
237/77	Foot warmer	3
237/79	Shields	31
237/73	Steam	5
237/74	Circuit	2
237/75	Heat accumulator	4
237/71	Water, steam	7
237/72	Injected	1
237/69	Heated floor	115
237/DIG.1	Inert gas	0
237/1R	Miscellaneous	338
237/1SL	Special liquid	10
237/13	Plants	23
237/81	Processes	39
237/67	Steam	41
237/68	Air discharge	4
237/28	Vehicle	21
237/45	Encased radiator	3
237/32	Fluid fuel	4
237/33	Radiator	1
237/44	Heat accumulator	4
237/43	Heated floor	4
237/40	Steam	2
237/41	Car boiler	0
237/42	Train steam	0
237/29	Stove	1
237/30	Air casing	2
237/31	Depending	0
237/34	Water	2
237/35	Car boiler	0
237/36	Fluid fuel	3
237/37	Train steam	0
237/38	Injected	0
237/39	Train steam	1
237/46	Ventilating	46
237/49	Enclosed radiator	6
237/48	Furnace	7
237/47	Stove	3
237/56	Water	69
237/59	Circulation	35
237/61	Auxiliary boiler	12
237/62	Boiler loop	1
237/60	Geyser boiler	9
237/63	Pump	35
237/64	Steam displacing	3
237/66	Expansion tanks	37
237/57	Fluid fuel	7
237/65	Pressure regulator	4
237/58	Steam	1