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Classification Resources
 
Class   122LIQUID HEATERS AND VAPORIZERS
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[List of Pre Grant Publications for class 122 subclass 1R][List of Patents for class 122 subclass 1R]  1R PLANTS
[List of Pre Grant Publications for class 122 subclass 4R][List of Patents for class 122 subclass 4R]  4R MISCELLANEOUS
 [List of Pre Grant Publications for class 122 subclass 5][List of Patents for class 122 subclass 5]5 GAS-PRODUCER
[List of Pre Grant Publications for class 122 subclass 5.51][List of Patents for class 122 subclass 5.51]5.51 AIR-INJECTED
[List of Pre Grant Publications for class 122 subclass 6R][List of Patents for class 122 subclass 6R]  6R INDUSTRIAL
 [List of Pre Grant Publications for class 122 subclass 10][List of Patents for class 122 subclass 10]10 FOR FLUID FUEL BURNER
 [List of Pre Grant Publications for class 122 subclass 11][List of Patents for class 122 subclass 11]11 ROTARY
 [List of Pre Grant Publications for class 122 subclass 12][List of Patents for class 122 subclass 12]12 ROTATABLY SUPPORTED
[List of Pre Grant Publications for class 122 subclass 13.01][List of Patents for class 122 subclass 13.01]13.01 STAND BOILER (E.G., WATER HEATER, ETC.)
[List of Pre Grant Publications for class 122 subclass 20R][List of Patents for class 122 subclass 20R]  20R SUBSIDIARY
 [List of Pre Grant Publications for class 122 subclass 29][List of Patents for class 122 subclass 29]29 ANNULAR FIREBOX
 [List of Pre Grant Publications for class 122 subclass 30][List of Patents for class 122 subclass 30]30 MAGAZINE
     INDIRECTLY HEATED
[List of Pre Grant Publications for class 122 subclass 31.1][List of Patents for class 122 subclass 31.1]31.1 INDIRECTLY HEATED SEPARATE INJECTED FLUID
 [List of Pre Grant Publications for class 122 subclass 35][List of Patents for class 122 subclass 35]35 ACCUMULATOR
 [List of Pre Grant Publications for class 122 subclass 36][List of Patents for class 122 subclass 36]36 AUXILIARY STEAM HEATER
[List of Pre Grant Publications for class 122 subclass 37][List of Patents for class 122 subclass 37]37 COMPARTMENT
     Subclass  indent level is 1 Auxiliary
 [List of Pre Grant Publications for class 122 subclass 39][List of Patents for class 122 subclass 39]39 FILM
[List of Pre Grant Publications for class 122 subclass 40][List of Patents for class 122 subclass 40]40 FLASHER
[List of Pre Grant Publications for class 122 subclass 42][List of Patents for class 122 subclass 42]42 FIRE AND WATER TUBE
[List of Pre Grant Publications for class 122 subclass 44.1][List of Patents for class 122 subclass 44.1]44.1 FIRE TUBE
 [List of Pre Grant Publications for class 122 subclass 44.2][List of Patents for class 122 subclass 44.2]44.2 Subclass 44.2 indent level is 1 With baffle in flue
 [List of Pre Grant Publications for class 122 subclass 49][List of Patents for class 122 subclass 49]49 Subclass 49 indent level is 1 Horizontal and vertical
     Subclass  indent level is 1 Horizontal or inclined
     Subclass  indent level is 2 Water firebox
[List of Pre Grant Publications for class 122 subclass 51][List of Patents for class 122 subclass 51]51 Subclass 51 indent level is 1 Horizontal
[List of Pre Grant Publications for class 122 subclass 52][List of Patents for class 122 subclass 52]52 Subclass 52 indent level is 2 Plural
     Subclass  indent level is 2 Central firebox
 [List of Pre Grant Publications for class 122 subclass 55][List of Patents for class 122 subclass 55]55 Subclass 55 indent level is 2 Cylinder
     Subclass  indent level is 2 Depending fire tube
     Subclass  indent level is 2 Double water firebox
[List of Pre Grant Publications for class 122 subclass 58R][List of Patents for class 122 subclass 58R]  58R Subclass 58R indent level is 2 Drop water firebox
[List of Pre Grant Publications for class 122 subclass 72][List of Patents for class 122 subclass 72]72 Subclass 72 indent level is 2 Projecting into firebox
     Subclass  indent level is 2 Return and reverse
[List of Pre Grant Publications for class 122 subclass 75][List of Patents for class 122 subclass 75]75 Subclass 75 indent level is 2 Return fire tube
 [List of Pre Grant Publications for class 122 subclass 79][List of Patents for class 122 subclass 79]79 Subclass 79 indent level is 2 Subjacent water arch
 [List of Pre Grant Publications for class 122 subclass 80][List of Patents for class 122 subclass 80]80 Subclass 80 indent level is 2 Subjacent flue
 [List of Pre Grant Publications for class 122 subclass 81][List of Patents for class 122 subclass 81]81 Subclass 81 indent level is 2 Subjacent transverse fire tube
     Subclass  indent level is 2 Superjacent feed heater
 [List of Pre Grant Publications for class 122 subclass 83][List of Patents for class 122 subclass 83]83 Subclass 83 indent level is 2 Transverse diaphragm
     Subclass  indent level is 2 Two diameters
 [List of Pre Grant Publications for class 122 subclass 87][List of Patents for class 122 subclass 87]87 Subclass 87 indent level is 2 U-coupling
 [List of Pre Grant Publications for class 122 subclass 88][List of Patents for class 122 subclass 88]88 Subclass 88 indent level is 2 Upper drum
     Subclass  indent level is 2 Water arch
[List of Pre Grant Publications for class 122 subclass 90][List of Patents for class 122 subclass 90]90 Subclass 90 indent level is 2 Water firebox
 [List of Pre Grant Publications for class 122 subclass 101][List of Patents for class 122 subclass 101]101 Subclass 101 indent level is 2 Water smoke box
     Subclass  indent level is 2 Water tube
     Subclass  indent level is 3 Horizontal
 [List of Pre Grant Publications for class 122 subclass 103][List of Patents for class 122 subclass 103]103 Subclass 103 indent level is 3 Rear of fire tube
     Subclass  indent level is 3 Rearwardly declined
     Subclass  indent level is 3 Rearwardly inclined
[List of Pre Grant Publications for class 122 subclass 106][List of Patents for class 122 subclass 106]106 Subclass 106 indent level is 2 Water wall
 [List of Pre Grant Publications for class 122 subclass 109][List of Patents for class 122 subclass 109]109 Subclass 109 indent level is 1 Inclined
     Subclass  indent level is 1 Transverse
[List of Pre Grant Publications for class 122 subclass 114][List of Patents for class 122 subclass 114]114 Subclass 114 indent level is 1 Vertical
 [List of Pre Grant Publications for class 122 subclass 134][List of Patents for class 122 subclass 134]134 Subclass 134 indent level is 1 Volute
 [List of Pre Grant Publications for class 122 subclass 46][List of Patents for class 122 subclass 46]46 Subclass 46 indent level is 1 Magazine
     Subclass  indent level is 1 Flue
 [List of Pre Grant Publications for class 122 subclass 45][List of Patents for class 122 subclass 45]45 Subclass 45 indent level is 1 Fluid fuel
[List of Pre Grant Publications for class 122 subclass 135.1][List of Patents for class 122 subclass 135.1]135.1 FLUE
 [List of Pre Grant Publications for class 122 subclass 135.2][List of Patents for class 122 subclass 135.2]135.2 Subclass 135.2 indent level is 1 Alternative stack
 [List of Pre Grant Publications for class 122 subclass 135.3][List of Patents for class 122 subclass 135.3]135.3 Subclass 135.3 indent level is 1 Sinusoidal flue
[List of Pre Grant Publications for class 122 subclass 136R][List of Patents for class 122 subclass 136R]  136R Subclass 136R indent level is 1 Horizontal
[List of Pre Grant Publications for class 122 subclass 155.1][List of Patents for class 122 subclass 155.1]155.1 Subclass 155.1 indent level is 1 Vertical
     HORIZONTAL CYLINDER
     PLATE
     Subclass  indent level is 1 Zigzag conduit
[List of Pre Grant Publications for class 122 subclass 209.1][List of Patents for class 122 subclass 209.1]209.1 SECTIONAL
     TANK
[List of Pre Grant Publications for class 122 subclass 235.11][List of Patents for class 122 subclass 235.11]235.11 WATER TUBE
 [List of Pre Grant Publications for class 122 subclass 235.12][List of Patents for class 122 subclass 235.12]235.12 Subclass 235.12 indent level is 1 Wall structure
 [List of Pre Grant Publications for class 122 subclass 235.13][List of Patents for class 122 subclass 235.13]235.13 Subclass 235.13 indent level is 1 With fuel burners having posts and tuyeres
 [List of Pre Grant Publications for class 122 subclass 235.14][List of Patents for class 122 subclass 235.14]235.14 Subclass 235.14 indent level is 1 Tube structure
 [List of Pre Grant Publications for class 122 subclass 235.15][List of Patents for class 122 subclass 235.15]235.15 Subclass 235.15 indent level is 1 Headers and connections
 [List of Pre Grant Publications for class 122 subclass 235.16][List of Patents for class 122 subclass 235.16]235.16 Subclass 235.16 indent level is 1 For plural fluids
 [List of Pre Grant Publications for class 122 subclass 235.17][List of Patents for class 122 subclass 235.17]235.17 Subclass 235.17 indent level is 1 Having baffles
 [List of Pre Grant Publications for class 122 subclass 235.18][List of Patents for class 122 subclass 235.18]235.18 Subclass 235.18 indent level is 1 Having seals
[List of Pre Grant Publications for class 122 subclass 235.19][List of Patents for class 122 subclass 235.19]235.19 Subclass 235.19 indent level is 1 D-type tube
 [List of Pre Grant Publications for class 122 subclass 235.22][List of Patents for class 122 subclass 235.22]235.22 Subclass 235.22 indent level is 1 Wall loop
 [List of Pre Grant Publications for class 122 subclass 235.23][List of Patents for class 122 subclass 235.23]235.23 Subclass 235.23 indent level is 1 Having specific tube patterns
[List of Pre Grant Publications for class 122 subclass 235.24][List of Patents for class 122 subclass 235.24]235.24 Subclass 235.24 indent level is 1 Screens
 [List of Pre Grant Publications for class 122 subclass 235.26][List of Patents for class 122 subclass 235.26]235.26 Subclass 235.26 indent level is 1 Having slag and ash disposal
 [List of Pre Grant Publications for class 122 subclass 235.27][List of Patents for class 122 subclass 235.27]235.27 Subclass 235.27 indent level is 1 Locomotive-type
 [List of Pre Grant Publications for class 122 subclass 235.28][List of Patents for class 122 subclass 235.28]235.28 Subclass 235.28 indent level is 1 Having rotary flame
 [List of Pre Grant Publications for class 122 subclass 235.29][List of Patents for class 122 subclass 235.29]235.29 Subclass 235.29 indent level is 1 Having forced circulation system
 [List of Pre Grant Publications for class 122 subclass 235.31][List of Patents for class 122 subclass 235.31]235.31 Subclass 235.31 indent level is 1 Having specific intenal drum and head structure
 [List of Pre Grant Publications for class 122 subclass 235.32][List of Patents for class 122 subclass 235.32]235.32 Subclass 235.32 indent level is 1 With combustion
 [List of Pre Grant Publications for class 122 subclass 235.33][List of Patents for class 122 subclass 235.33]235.33 Subclass 235.33 indent level is 1 With convection zone regulation
 [List of Pre Grant Publications for class 122 subclass 235.34][List of Patents for class 122 subclass 235.34]235.34 Subclass 235.34 indent level is 1 With parallel multiple fireboxes
 [List of Pre Grant Publications for class 122 subclass 235.35][List of Patents for class 122 subclass 235.35]235.35 Subclass 235.35 indent level is 1 With serial multiple fireboxes
 [List of Pre Grant Publications for class 122 subclass 238][List of Patents for class 122 subclass 238]238 Subclass 238 indent level is 1 Offset firebox
 [List of Pre Grant Publications for class 122 subclass 239][List of Patents for class 122 subclass 239]239 Subclass 239 indent level is 1 Superimposed firebox
[List of Pre Grant Publications for class 122 subclass 240.1][List of Patents for class 122 subclass 240.1]240.1 Subclass 240.1 indent level is 1 Having plural fireboxes
 [List of Pre Grant Publications for class 122 subclass 241][List of Patents for class 122 subclass 241]241 Subclass 241 indent level is 1 Firebox in drum
[List of Pre Grant Publications for class 122 subclass 242][List of Patents for class 122 subclass 242]242 Subclass 242 indent level is 1 Capillary
     Subclass  indent level is 1 Coil or loop
[List of Pre Grant Publications for class 122 subclass 247][List of Patents for class 122 subclass 247]247 Subclass 247 indent level is 1 Coil
[List of Pre Grant Publications for class 122 subclass 253][List of Patents for class 122 subclass 253]253 Subclass 253 indent level is 1 Cross
 [List of Pre Grant Publications for class 122 subclass 254][List of Patents for class 122 subclass 254]254 Subclass 254 indent level is 2 Over bridge wall
     Subclass  indent level is 2 Over firebox
     Subclass  indent level is 3 Longitudinal
     Subclass  indent level is 4 Header
     Subclass  indent level is 3 Transverse
     Subclass  indent level is 4 Header
     Subclass  indent level is 2 Transverse
     Subclass  indent level is 3 Header
 [List of Pre Grant Publications for class 122 subclass 258][List of Patents for class 122 subclass 258]258 Subclass 258 indent level is 1 Downflow
 [List of Pre Grant Publications for class 122 subclass 259][List of Patents for class 122 subclass 259]259 Subclass 259 indent level is 1 Drum type
[List of Pre Grant Publications for class 122 subclass 260][List of Patents for class 122 subclass 260]260 Subclass 260 indent level is 1 Flat
[List of Pre Grant Publications for class 122 subclass 262][List of Patents for class 122 subclass 262]262 Subclass 262 indent level is 1 Horizontal
 [List of Pre Grant Publications for class 122 subclass 265][List of Patents for class 122 subclass 265]265 Subclass 265 indent level is 1 Inclined
[List of Pre Grant Publications for class 122 subclass 266][List of Patents for class 122 subclass 266]266 Subclass 266 indent level is 1 Internal fire tube
[List of Pre Grant Publications for class 122 subclass 273][List of Patents for class 122 subclass 273]273 Subclass 273 indent level is 1 Longitudinal upper drum
[List of Pre Grant Publications for class 122 subclass 275][List of Patents for class 122 subclass 275]275 Subclass 275 indent level is 1 Loop
     Subclass  indent level is 1 Over bridge wall
     Subclass  indent level is 1 Over firebox
     Subclass  indent level is 1 Rearwardly declined
     Subclass  indent level is 1 Rearwardly inclined
     Subclass  indent level is 2 Over firebox
     Subclass  indent level is 3 Front and rear header
     Subclass  indent level is 1 Separate banks
[List of Pre Grant Publications for class 122 subclass 305][List of Patents for class 122 subclass 305]305 Subclass 305 indent level is 1 Spur
[List of Pre Grant Publications for class 122 subclass 321][List of Patents for class 122 subclass 321]321 Subclass 321 indent level is 1 Standpipe
[List of Pre Grant Publications for class 122 subclass 324][List of Patents for class 122 subclass 324]324 Subclass 324 indent level is 1 Straddle
 [List of Pre Grant Publications for class 122 subclass 331][List of Patents for class 122 subclass 331]331 Subclass 331 indent level is 1 Transverse horizontal drum
[List of Pre Grant Publications for class 122 subclass 332][List of Patents for class 122 subclass 332]332 Subclass 332 indent level is 1 Vertical
[List of Pre Grant Publications for class 122 subclass 353][List of Patents for class 122 subclass 353]353 Subclass 353 indent level is 1 Water grate
[List of Pre Grant Publications for class 122 subclass 355][List of Patents for class 122 subclass 355]355 Subclass 355 indent level is 1 Zigzag
 [List of Pre Grant Publications for class 122 subclass 237][List of Patents for class 122 subclass 237]237 Subclass 237 indent level is 1 Magazine
 [List of Pre Grant Publications for class 122 subclass 236][List of Patents for class 122 subclass 236]236 Subclass 236 indent level is 1 Fluid fuel
     Subclass  indent level is 1 Headers
 [List of Pre Grant Publications for class 122 subclass 365][List of Patents for class 122 subclass 365]365 Subclass 365 indent level is 1 Drums and couplings
 [List of Pre Grant Publications for class 122 subclass 366][List of Patents for class 122 subclass 366]366 WICK
[List of Pre Grant Publications for class 122 subclass 367.1][List of Patents for class 122 subclass 367.1]367.1 HEAT TRANSMITTER
[List of Pre Grant Publications for class 122 subclass 368][List of Patents for class 122 subclass 368]368 WATER FIREBOX
[List of Pre Grant Publications for class 122 subclass 371][List of Patents for class 122 subclass 371]371 WATER GRATE
     Subclass  indent level is 1 Plural firebox
     Subclass  indent level is 2 Superimposed
     Subclass  indent level is 3 Water grate
 [List of Pre Grant Publications for class 122 subclass 373][List of Patents for class 122 subclass 373]373 Subclass 373 indent level is 1 Cage
[List of Pre Grant Publications for class 122 subclass 374][List of Patents for class 122 subclass 374]374 Subclass 374 indent level is 1 Grate structure
 [List of Pre Grant Publications for class 122 subclass 376][List of Patents for class 122 subclass 376]376 Subclass 376 indent level is 1 Progressive feed
     Subclass  indent level is 1 Water firebox
     Subclass  indent level is 2 Solid and water bar
 [List of Pre Grant Publications for class 122 subclass 378][List of Patents for class 122 subclass 378]378 Subclass 378 indent level is 2 Updraft
 [List of Pre Grant Publications for class 122 subclass 21][List of Patents for class 122 subclass 21]21 CHEMICAL
 [List of Pre Grant Publications for class 122 subclass 22][List of Patents for class 122 subclass 22]22 FLUID AND SOLID FUEL
[List of Pre Grant Publications for class 122 subclass 23][List of Patents for class 122 subclass 23]23 FLUID FUEL
 [List of Pre Grant Publications for class 122 subclass 24][List of Patents for class 122 subclass 24]24 Subclass 24 indent level is 1 Explosion
     Subclass  indent level is 1 Plural burner
 [List of Pre Grant Publications for class 122 subclass 26][List of Patents for class 122 subclass 26]26 FRICTION GENERATOR
     NONCOMBUSTIBLE HEATER
[List of Pre Grant Publications for class 122 subclass 379][List of Patents for class 122 subclass 379]379 CLEANING
[List of Pre Grant Publications for class 122 subclass 406.1][List of Patents for class 122 subclass 406.1]406.1 CIRCULATION
[List of Pre Grant Publications for class 122 subclass 412][List of Patents for class 122 subclass 412]412 FEED HEATERS
     REGULATION
     Subclass  indent level is 1 Fuel and water
 [List of Pre Grant Publications for class 122 subclass 450][List of Patents for class 122 subclass 450]450 Subclass 450 indent level is 1 Suspended boiler
[List of Pre Grant Publications for class 122 subclass 448.1][List of Patents for class 122 subclass 448.1]448.1 AUTOMATIC CONTROL OF FLUID FUEL AND WATER
[List of Pre Grant Publications for class 122 subclass 451R][List of Patents for class 122 subclass 451R]  451R FEEDERS
[List of Pre Grant Publications for class 122 subclass 459][List of Patents for class 122 subclass 459]459 STEAM TREATMENT
     SEPARATORS
 [List of Pre Grant Publications for class 122 subclass 493][List of Patents for class 122 subclass 493]493 BRACES AND STAYS
 [List of Pre Grant Publications for class 122 subclass 494][List of Patents for class 122 subclass 494]494 CASINGS
 [List of Pre Grant Publications for class 122 subclass 495][List of Patents for class 122 subclass 495]495 CROWN SHEETS PROTECTING
 [List of Pre Grant Publications for class 122 subclass 496][List of Patents for class 122 subclass 496]496 CROWN SHEETS AND STAYS
[List of Pre Grant Publications for class 122 subclass 497][List of Patents for class 122 subclass 497]497 FRONTS
[List of Pre Grant Publications for class 122 subclass 501][List of Patents for class 122 subclass 501]501 FLUID-DISPLACER
 [List of Pre Grant Publications for class 122 subclass 503][List of Patents for class 122 subclass 503]503 FUEL BAFFLES
[List of Pre Grant Publications for class 122 subclass 504][List of Patents for class 122 subclass 504]504 SAFETY DEVICES
 [List of Pre Grant Publications for class 122 subclass 508][List of Patents for class 122 subclass 508]508 STEAM DOMES
 [List of Pre Grant Publications for class 122 subclass 509][List of Patents for class 122 subclass 509]509 SUBMERGED STEAM CHAMBER
 [List of Pre Grant Publications for class 122 subclass 510][List of Patents for class 122 subclass 510]510 SUPPORTS
 [List of Pre Grant Publications for class 122 subclass 511][List of Patents for class 122 subclass 511]511 TUBES AND CONNECTIONS
 [List of Pre Grant Publications for class 122 subclass 512][List of Patents for class 122 subclass 512]512 TUBE SHEETS
 
FOREIGN ART COLLECTIONS
 
      FOR000          CLASS-RELATED FOREIGN DOCUMENTS
Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collections listed below. These Collections contain ONLY foreign patents or non-patent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived.
  FOR100          STAND BOILER (122/13.1)
      FOR101          Subclass FOR101 indent level is 1 Electric (122/13.2)
     Subclass  indent level is 1 Fire tube and water tube (122/unnumbered)
      FOR102          Subclass FOR102 indent level is 2 Fluid fuel (122/16)
     Subclass  indent level is 1 Fire tube (122/unnumbered)
      FOR103          Subclass FOR103 indent level is 2 Fluid fuel (122/17)
     Subclass  indent level is 1 Water tube (122/unnumbered)
     Subclass  indent level is 2 Below boiler (122/unumbered)
      FOR104          Subclass FOR104 indent level is 3 Fluid fuel (122/18)
     Subclass  indent level is 2 Casing (122/unnumbered)
      FOR105          Subclass FOR105 indent level is 3 Fluid fuel (122/19)
      FOR106          Subclass FOR106 indent level is 1 Fluid fuel (122/14)
      FOR107          Subclass FOR107 indent level is 1 Solid fuel (122/15)
 
DIGESTS
 
 [List of Pre Grant Publications for class 122 subclass DIG1][List of Patents for class 122 subclass DIG1] DIG1 AIR HEATER
 [List of Pre Grant Publications for class 122 subclass DIG2][List of Patents for class 122 subclass DIG2] DIG2 AIR HEATER - INDIRECTLY HEATED
 [List of Pre Grant Publications for class 122 subclass DIG3][List of Patents for class 122 subclass DIG3] DIG3 GAS FLOW BAFFLES
 [List of Pre Grant Publications for class 122 subclass DIG4][List of Patents for class 122 subclass DIG4] DIG4 ONCE THROUGH BOILERS
 [List of Pre Grant Publications for class 122 subclass DIG5][List of Patents for class 122 subclass DIG5] DIG5 CRITICAL PRESSURE
 [List of Pre Grant Publications for class 122 subclass DIG6][List of Patents for class 122 subclass DIG6] DIG6 DAMPER-DIRECTED RADIATION
 [List of Pre Grant Publications for class 122 subclass DIG7][List of Patents for class 122 subclass DIG7] DIG7 FEEDING AIR
 [List of Pre Grant Publications for class 122 subclass DIG10][List of Patents for class 122 subclass DIG10] DIG10 PORTABLE UNITS
 [List of Pre Grant Publications for class 122 subclass DIG11][List of Patents for class 122 subclass DIG11] DIG11 REMOVABLE STEAM-HEATING ELEMENTS
 [List of Pre Grant Publications for class 122 subclass DIG13][List of Patents for class 122 subclass DIG13] DIG13 TUBES - COMPOSITION AND PROTECTION
 [List of Pre Grant Publications for class 122 subclass DIG14][List of Patents for class 122 subclass DIG14] DIG14 TUBE REPLACEMENT
 [List of Pre Grant Publications for class 122 subclass DIG15][List of Patents for class 122 subclass DIG15] DIG15 VALVES
 [List of Pre Grant Publications for class 122 subclass DIG16][List of Patents for class 122 subclass DIG16] DIG16 WELDING