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| Class 202 | DISTILLATION: APPARATUS |
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![[List of Pre Grant Publications for class 202 subclass 81]](../as.gif) | ![[List of Patents for class 202 subclass 81]](../ps.gif) | 81 | APPARATUS |
| | 82 |  Systems |
| | 83 |  Portably mounted |
| | 84 | Separatory and thermolytic |
| | 85 | Thermolytic and autothermic |
| | 91 | Autothermic |
| | 96 | Thermolytic |
| | 97 |  Stalls |
| | 99 | Directly heated chamber |
| | 101 | Dome ovens |
| | 102 | Hearths |
| | 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 |
| | 117 | Conveying |
| | 120 | Vertical |
| | 128 | Inclined |
| | 133 | Horizontal |
| | 134 |  With fluid injection to retort |
| | 135 | Plural gas and/or air admission |
| | 136 | Rotary |
| | 137 | With heating chamber |
| | 138 | With flues |
| | 147 | Gas bench |
| | 150 | Preheating |
| | 151 | Combustion control devices |
| | 152 | Separatory |
| | 153 | Still and column |
| | 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 |
| | 170 | Still extractor |
| | 172 | Plural |
| | 175 | With agitator |
| | 176 | With distilland treating devices |
| | 182 | With vapor-treating devices |
