PTO Manual of Classification for US patents

PTO Manual of Classification for US patents

What follows are the subclasses from one class of the Manual of Classification for US patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retrieve patent titles by entering the class/subclass in the box below.


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363-131 121-55A 14-.5
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Class Number: 48
 Class Title: GAS: HEATING AND ILLUMINATING

Subclass  Subclass
Number    Title

  *       ACETYLENE
  1       .Generation and liquefaction
  2       .Generator and holder
  3 R     .Generator and mixer
  3 A     ..Special features
         .Generators
  4       ..Water feed
  5       ...Holder operated
  6       ....Series
  7       .....Automatic switch
  8       ....Cell series
  9       ....Gasometer and high-pressure holder
  10      ....Interior valve
  11      ....Rotary cylinder
  12      ....Underfeed
  13      ....Valveless
  14      .....Displacer
  15      .....Flexible tube
  16      .....Generator supported
  17      .....Siphon
  18      .....Tilting
  19      ...Ebb and flow
  20      ....Series
  21      ....Cell series
  22      ....Concentric
  23      ...Series
  24      ...Cell series
  25      ...Capillary
  26      ....Adjustable
  27      ...Percolating
  28      ....Pressure valves
  29      ...Expansible carbide container
  30      ...Expansible water holder
  31      ...Inexpansible gas holder and water feed
  32 R    ...Oscillating
  32 A    ....Floating generator or carbide container
  32 B    ....With inversion to contact carbide
  33      ...Rotary cylinder
  34      ...Rotary grate
  35      ...Underfeed
  36      ...Interlocking devices
  37      ...Pressure valves
  38      ..Carbide feed
  39      ...Apron or belt
  40      ...Cock
  41      ...Dip
  42      ....Cell series
  43      ...Flap valve
  44      ...Hand
  45      ....Dip
  46      ...Measured charges
  47      ....Cartridgess
  48      ....Rotary carrier
  49      .....Vertical
  50      ....Stationary
  51      ...Piston
  52      ...Plate valve
  53      ...Pop valve
  53.1    ....Bell operated
  53.2    .....Bell and holder combined
  53.3    ....Diaphragm operated
  53.4    ....Float operated
  54      ...Screw
  55      ...Slide valve
  58      ..Valves, gas and water feed
  56      ..Automatic safety escape
  57      ..Sludge remover
  59      .Carbide cartridges
  60      ..Conglomerate
  61      GENERATORS
         .Hydrogen
  116     ..Carburetor
  117     ...Air
  118     ...Floating oil
  62 R    .Cupola
  71      ..Coal, oil and water
  72      ..Coal and oil
  73      ..Coal and water
  76      ..Producers
  77      ..Coal
  78      ..Water
  79      ...Carburetor
  80      ....Fixer
  81      ....Retort
  84      ...Oil gas
  82      ...Up-and-down run
  83      ....Interlocking valves
  85      ..Carbon monoxide
  75      ..Oil and steam injected
  63      ..Air and steam injected
  64      ...Superheated
  65      ..Electric
  66      ..Rotary bottom
  67      ..Water jacket
  68      ...Rotary bottom
  69      ..Water-seal pit
  74      ..Refractory filling
  85.1    ..Fuel agitating
  85.1    ...Movable wall
  85.2    ...Stirrer
  86 R    ..Chargers
  86 A    ...Gas making underfeed
  87      ..Accessories
  62 A    ..Partial combustion carburetor
  89      .Retort
  98      ..Coal, oil and water
  99      ..Coal and water
  100     ..Coal and oil
  101     ..Coal
  102 R   ..Oill
  103     ...Electric heater
  104     ...Jet mixers
  105     ...Steam injected
  106     ...Automatic feed
  107     ...Air injected
  102 A   ...Utilizing heat from exhaust gases
  108     ..Water
  109     ...Carburetor
  110     ...Oil gas
  111     ..Wood
  112     ...Oil
  92      ..Metal bath
  93      ..Oil and gas injected
  94      ..Oil and steam injected
  95      ...Air
  96      ...Carburetor
  90      ..Domestic plants
  113     ..Furnaces
  118.5   .Portable
  119     RETORTS
  120     .Compounds
  122     .Inclined
  123     .Vertical
  124     .Lids
  126     .Attachments
  127.1   CONVERSION OF HYDROCARBON GAS AND BLENDING OF PRODUCT WITH
           FURTHER HYDROCARBON GAS, PROCESS
  127.3   METHANE (NATURAL GAS) -CONTAINING PRODUCT, OR TREATMENT OR
           RECOVERY PROCESS
  127.5   .Process including chemical reaction
  127.7   ..Catalytic
  127.9   APPARATUS FOR CONVERTING OR TREATING HYDROCARBON GAS
  144     CARBURETORS
  160     .Gravity
  128     PURIFIERS
  170     CENTER AND BY-PASS VALVES
  173     EXHAUSTERS
  174     HOLDERS
  175     .High-pressure safety escape
  176     .Bell and tank
  177     ..Sectional bell
  178     .Collapsible
  179     .Tank
  180.1   MIXERS
  181     .Bell and tank
  182     ..Anterior
  183     ..Posterior
  184     .Diaphragm
  185     .Gravity
  186     .Pump
  187     .Rotary drum
  188     ..Anterior
  189     ..Posterior
  189.1   .Three or more different fluids entering apparatus
  189.2   .With heating means
  189.3   .Auxilary air inlet
  189.4   .Mixer in flow path of existing mixture
  189.5   ..Rotating mixerr
  189.6   ..Includes element made of engaged strands or fibers, e.g.,
             screen, fabric, etc.
  190     DISTRIBUTION
  191     .Regulating pressure
  192     .Safety devices
  193     .Leakage
  194     ..Preventing
  195     ..Odorizers
  197 R   PROCESSES
  198.1   .Manufacture from methane (natural gas)
  198.2   ..Employing carbon particles, porous barrier element or
             molten material
  198.3   ..With specified treatment of converted product, e.g.,
             purification, particular cooling, testing, etc.
  198.5   ..Employing oxygen donor particles or carbidable metal
             particles
  198.6   ..Specified direction of gas travel through particle mass,
             e.g., fluidization, flow reversal, etc.
  198.7   ..Employing catalytic particles
  198.8   ..With specified reactant velocity, angle of entry to
             reactor or mechanical energy production, e.g., use of internal
             combustion engine, etc.
         .Hydrogen
  199 R   ..Carbureting
  199 FM  ...Fuel mixtures
  200     .Coal, oil and water
  201     .Coal and oil
  202     .Coal and water
  203     .Producer
  204     .Water
  205     ..Carbureting
  206     ..Continuous
  207     ..Down run
  208     ..Up-and-down run
  209     .Wood
  210     .Coal
  211     .Oil
  212     ..Air injected
  213     ..Gas injected
  214 R   .Oil and steam injected
  215     ..Air
  214 A   ..Catalytic processes
  216     .Acetylene
  217     ..Slow
  219     .Carbureting
  197 FM  .Fuel mixtures
  197 A   .Sewage treatment
  *       ******************************
  *       DIGESTS
  *       ******************************
  DIG 1   Recirculation of gases produced to lower part of fuel bed
  DIG 2   Slagging producer
  DIG 3   High pressure
  DIG 4   Powdered fuel injection
  DIG 5   Diffusion membrane for gas reaction or separation
  DIG 6   Underground gasification of coal
  DIG 7   Slurry
  DIG 8   Internal combustion engine for gas makingg
  DIG 9   Solar gasification
  DIG 10  Computer resisted control