US Patent Class 122
LIQUID HEATERS AND VAPORIZERS-- Main Headings



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Current as of: June, 1999
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CLASS NOTES
1 R  DF  PLANTS {5}
4 R  DF  MISCELLANEOUS {3}
5  DF  GAS-PRODUCER
5.51  DF  AIR-INJECTED {1}
6 R  DF  INDUSTRIAL {7}
10  DF  FOR FLUID FUEL BURNER
11  DF  ROTARY
12  DF  ROTATABLY SUPPORTED
13.1  DF  STAND BOILER {6}
20 R  DF  SUBSIDIARY {2}
29  DF  ANNULAR FIREBOX
30  DF  MAGAZINE
*  DF  INDIRECTLY HEATED {1}
31.1  DF  INDIRECTLY HEATED SEPARATE INJECTED FLUID {1}
35  DF  ACCUMULATOR
36  DF  AUXILIARY STEAM HEATER
37  DF  COMPARTMENT {1}
39  DF  FILM
40  DF  FLASHER {1}
42  DF  FIRE AND WATER TUBE {1}
44.1  DF  FIRE TUBE {11}
135.1  DF  FLUE {4}
*  DF  HORIZONTAL CYLINDER {6}
*  DF  PLATE {1}
209.1  DF  SECTIONAL {9}
*  DF  TANK {2}
235.11  DF  WATER TUBE {52}
366  DF  WICK
367.1  DF  HEAT TRANSMITTER {3}
368  DF  WATER FIREBOX {2}
371  DF  WATER GRATE {5}
21  DF  CHEMICAL
22  DF  FLUID AND SOLID FUEL
23  DF  FLUID FUEL {2}
26  DF  FRICTION GENERATOR
*  DF  NONCOMBUSTIBLE HEATER {2}
379  DF  CLEANING {9}
406.1  DF  CIRCULATION {7}
412  DF  FEED HEATERS {17}
*  DF  REGULATION {2}
448.1  DF  AUTOMATIC CONTROL OF FLUID FUEL AND WATER {3}
451 R  DF  FEEDERS {4}
459  DF  STEAM TREATMENT {7}
*  DF  SEPARATORS {5}
493  DF  BRACES AND STAYS
494  DF  CASINGS
495  DF  CROWN SHEETS PROTECTING
496  DF  CROWN SHEETS AND STAYS
497  DF  FRONTS {2}
501  DF  FLUID-DISPLACER {1}
503  DF  FUEL BAFFLES
504  DF  SAFETY DEVICES {4}
508  DF  STEAM DOMES
509  DF  SUBMERGED STEAM CHAMBER
510  DF  SUPPORTS
511  DF  TUBES AND CONNECTIONS
512  DF  TUBE SHEETS
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DIGESTS
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DIG 1  DF  Air heater
DIG 2  DF  Air heater - indirectly heated
DIG 3  DF  Gas flow baffles
DIG 4  DF  Once through boilers
DIG 5  DF  Critical pressure
DIG 6  DF  Damper-directed radiation
DIG 7  DF  Feeding air
DIG 10  DF  Portable units
DIG 11  DF  Removable steam-heating elements
DIG 13  DF  Tubes - composition and protection
DIG 14  DF  Tube replacement
DIG 15  DF  Valves
DIG 16  DF  Welding