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.


Enter a class/subclass code here to get a list of patent titles. Use any of the following forms:
363-131 121-55A 14-.5
that is, no embedded spaces, class and subclass seperated by a dash, and any subclass letters capitalized. Currently Design Patent titles (those in the classes of the form Dxx.yy) are not retreivable.

Enter class/subclass code:


Class Number: 202
 Class Title: DISTILLATION: APPARATUS

Subclass  Subclass
Number    Title

  81      APPARATUS
  82      .Systems
  83      ..Portably mounted
  84      ..Separatory and thermolytic
  85      ..Thermolytic and autothermic
  86      ...Retort and kiln
  87      ....Retort heated by combustion
  88      ...Kiln and directly heated chamber
  89      ....Interchangeable
  90      ....Chamber externally heated
  91      ..Autothermic
  92      ...Open kiln
  93      ...Closed kiln
  94      ....With steam generator
  95      ....With residue quencher or cooler
  96      ..Thermolytic
  97      ...Stalls
  98      ....Tunnels
  99      ...Directly heated chamber
  100     ....Rotary chamber
  101     ...Dome ovens
  102     ...Hearths
  103     ....Distilland transferring
  104     .....Vertical series
  105     ...Retort
  106     ....With steam generation
  107     ....With digester
  108     ....With direct heating
  109     ....With cyclic volatile circulation
  110     ....With distilland pressure
  111     ....With recuperators and regenerators
  112     ....With distillate fixing chamber
  113     ....Plural
  114     .....Common heating furnace
  115     .....Annularly arranged
  116     .....Vertical and horizontal or inclined
  117     ....Conveying
  118     .....Screw
  119     .....Reciprocating
  120     ....Vertical
  121     .....With fluid injection
  122     .....With recuperator
  123     .....With regenerator
  124     .....With heating chamber
  125     ......Alternate reverse flow flues
  126     ......Vertical flues
  127     ......Circumvallate flues
  128     ....Inclined
  129     .....With fluid injection
  130     .....With regenerator or recuperator
  131     .....Rotary
  132     .....Gas benchh
  133     ....Horizontal
  134     .....With fluid injection to retort
  135     .....Plural gas and/or air admission
  136     .....Rotary
  137     .....With heating chamber
  138     .....With flues
  139     ......Vertical
  140     .......With recuperators
  141     .......With reversible regenerators
  142     ........Alternatively poor and/or rich gas fuel
  143     ........Regenerators reversing along the system
  144     ........Regenerators reversing across the system
  145     ......Horizontal
  146     .......With regenerators
  147     .....Gas bench
  148     ......With recuperator
  149     ......With fluid injection
  150     ....Preheating
  151     ....Combustion control devices
  152     ..Separatory
  153     ...Still and column
  154     ....Plural columns
  155     ....Plural stills
  156     .....Parallel
  158     ...Column
  159     ....With preheater
  160     ....Automatic temperature and/or pressure control
  161     ....Partial reflux condenser
  162     ....Vapor-element by-pass
  163     ...Still
  164     ....Recovery from containers
  165     ....Still and stove
  166     ....Still and stand boiler
  167     ....Still and feed-water heater
  168     ....Still and extractor
  169     .....Continuous extraction
  170     ....Still extractor
  172     ....Plural
  173     .....Series
  174     ......Multiple effect
  175     ....With agitator
  176     ....With distilland treating devices
  177     .....Preheater
  178     ......Straining
  179     ......Dephlegmating
  180     ......Condensing
  181     .....Level control
  182     ....With vapor-treating devices
  183     .....Still and absorber
  184     ......Still absorber
  185.1   .....Condenser
  185.2   ......Direct contact
  185.3   ......Air condensers
  185.4   ......Circulating coolant in cap or top closure
  185.5   ......Helical coil for vapor stream
  185.6   ......Helical coil for coolant
  186     ......Plural
  187     ......Concentric with stilll
  188     ......Still supporting
  189     ......Still supported
  190     .......Cap (or closure)
  191     ........Jacketed
  192     .........Still feeding
  193     ..........Distilland-level control
  194     .......Still feeding
  195     ......Still feeding
  196     .......Distilland-level control
  197     .....With separator
  198     .....Dephlegmator
  199     .....Doubler
  200     .....Filter
  201     .....Aerator
  202     ....With condensate-treating devices
  203     .....Aeration
  204     .....Decanter
  205     ....Vacuum
  206     ....Automatic heat control
         .Types
         ..Separatory and thermolytic
  207     ...Stump stills
  208     ...Directly heated chamber
  209     ...Still retort
         ..Autothermic
  210     ...Heap
  211     ...Kiln
  212     ....Arched
  213     ....Partable and/or knockdown
  214     ....Bottom discharge
  215     ...Directly heated chamber
  216     ....Rotary
  217     ...Retort
  218     ....Rotary and/or tilting
  219     ....Molten bath
  220     ....Flued
  221     ....Vertical
  222     ....Structural features
  223     .....Wall
  224     .....Shields
  225     .....Cores
  226     ....Residue treatment
  227     ...Quencher
  228     ....Gas or vapor circulating
  229     ....Submersible chamber
  230     ....Conveyer type
         ..Separatory
  232     ...Still
  233     ....Directly and indirectly heated
  234     ....Directly heated
  235     ....Indirectly heated
  236     ....Spray forming and filming
  237     ....Tubular
  238     ....Rotary and/or tiltable
  239     .Elements
  241     ..Cleaning and decarbonizing
  242     ..Closures
  243     ...Fluid cooledd
         ...Dome ovens
  244     ....Tunnel heads and lids
  245     ....Removable
  246     ....Hinged
  247     ...Horizontal retort
  248     ....Coke-oven type
  249     ....Rotary retort
  250     ...Top
  251     ....Charging
  252     ...Bottom
  253     ....Cooling or quenching
  254     ..Offtakes
  255     ...Dip pipes and mains
  256     ....Valved
  257     ...Plural
  258     ...Valved
  259     ...Jacketed
  260     ...Cooled
  261     ...Residue offtakes
  262     ..Feeding and discharging
  263     ...Smoke escapes
  264     ..Foam control
  265     ..Agitating
  266     ..Distilland supports and containers
  267.1   ..Materials of construction
  267.2   ...Corrugated walls
  268     ..Expansion provisions
  269     ..Air and gas seals
  270     .Accessories and details
  *       ******************************
  *       DIGEST
  *       ******************************
  DIG 1   Scale problems digest