US Patent Class 237
HEATING SYSTEMS



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Current as of: June, 1999
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  DF  CLASS NOTES
1 R  DF  MISCELLANEOUS
1 SL  DF  .~ Special liquid
2 R  DF  AUTOMATIC CONTROL
3  DF  .~ Brooder and incubator
4  DF  .~.~ Water
5  DF  .~ Car
6  DF  .~.~ Steam
7  DF  .~ Combined radiator and boiler
8 R  DF  .~ Water
8 A  DF  .~.~ Automatic heating systems (water) with controls
8 B  DF  .~.~ Heating systems with high temperature boiling liquids
8 C  DF  .~.~ With boiler by-pass valve control
8 D  DF  .~.~ Compact heating systems with controls
9 R  DF  .~ Steam
10  DF  .~.~ Gas displaced
9 A  DF  .~.~ Automotive systems
9 B  DF  .~.~ With direct contact between products of combustion and the liquid to be vaporized
11  DF  .~ Compressed air
12  DF  .~ Processes
2 A  DF  .~ Automatic heating systems with controls
2 B  DF  .~ Heat source is a reverse cycle refrigerating system or heat pump
12.1  DF  HEAT AND POWER PLANTS
12.2  DF  .~ Fire engine
12.3 R  DF  .~ Vehicle
12.3 A  DF  .~.~ The heating is effected by circulated air
12.3 B  DF  .~.~ The heating is effected by circulated hot water
12.3 C  DF  .~.~ The heating system includes a combustion type heater
12.4  DF  .~ Car
12.5  DF  .~.~ Smoke
12.6  DF  .~.~ Air
12.7  DF  .~.~.~ Radiator
12.8  DF  .~.~ Steam
13  DF  PLANTS
14  DF  BROODER AND INCUBATOR
15  DF  .~ Water
16  DF  COMBINED RADIATOR AND BOILER
17  DF  .~ Fluid fuel
18  DF  .~ Solid fuel
19  DF  COMBINED WITH WATER HEATER
28  DF  VEHICLE
29  DF  .~ Stove
30  DF  .~.~ Air casing
31  DF  .~.~ Depending
32  DF  .~ Fluid fuel
33  DF  .~.~ Radiator
34  DF  .~ Water
35  DF  .~.~ Car boiler
36  DF  .~.~.~ Fluid fuel
37  DF  .~.~.~ Train steam
38  DF  .~.~.~.~ Injected
39  DF  .~.~ Train steam
40  DF  .~ Steam
41  DF  .~.~ Car boiler
42  DF  .~.~.~ Train steam
43  DF  .~ Heated floor
44  DF  .~ Heat accumulator
45  DF  .~ Encased radiator
69  DF  HEATED FLOOR
46  DF  VENTILATING
47  DF  .~ Stove
48  DF  .~ Furnace
49  DF  .~ Enclosed radiator
50  DF  AIR
52  DF  .~ Stove
53  DF  .~ Furnace
54  DF  .~ Upper-room drum
55  DF  .~ Flue heated
56  DF  WATER
57  DF  .~ Fluid fuel
58  DF  .~ Steam
59  DF  .~ Circulation
60  DF  .~.~ Geyser boiler
61  DF  .~.~ Auxiliary boiler
62  DF  .~.~ Boiler loop
63  DF  .~.~ Pump
64  DF  .~.~.~ Steam displacing
65  DF  .~ Pressure regulator
66  DF  .~ Expansion tanks
67  DF  STEAM
68  DF  .~ Air discharge
70  DF  HEAT RADIATORS
71  DF  .~ Water, steam
72  DF  .~.~ Injected
73  DF  .~ Steam
74  DF  .~.~ Circuit
75  DF  .~.~ Heat accumulator
76  DF  .~ Ceramic
77  DF  .~ Foot warmer
78 R  DF  .~ Air moistener
78 A  DF  .~.~ Casing
78 B  DF  .~.~ Radiator wick
78 C  DF  .~.~ From radiator valve
79  DF  .~ Shields
80  DF  ANTIFREEZING DEVICES
81  DF  PROCESSES
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DIGEST
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DIG 1  DD  Inert gas