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Class 123 | INTERNAL-COMBUSTION ENGINES |
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| 1R | MISCELLANEOUS |
| 2 | COMBINED DEVICES |
| 200 | ROTARY |
| 201 | Reversible |
| 202 | With means to control degree of compression |
| 203 | With combusted gas treatment or handling means |
| 204 | With compression volume means in uninterrupted communication with expansion volume means |
| 205 | With fuel injection means |
| 210 | With ignition means |
| 212 | With plural compression volume means |
| 214 | With plural expansion volume means |
| 216 | With charge treatment means |
| 221 | With transfer means intermediate single compression volume means and single expansion volume means |
| 222 | Isolated charge in movable transfer element |
| 223 | Reciprocating or oscillating compression volume means |
| 228 | Compression volume means circumferentially disposed relative to expansion volume means |
| 229 | Transfer means in rotor |
| 230 | Compression volume is also expansion volume |
| 231 | Vane |
| 232 | Interengaging rotors |
| 234 | Compression volume means axially disposed relative to expansion volume means |
| 239 | Compression volume means radially disposed relative to expansion volume means |
| 241 | With compression, combustion, and expansion in a single variable volume |
| 247 | Only combustion and expansion of charge in engine |
| 18R | OSCILLATING PISTON |
| 19 | LIQUID PISTON |
| 21 | CONVERTIBLE CYCLE |
| 22 | INTERNAL COMBUSTION AND AIR |
| 23 | SOLID FUEL |
| 24R | GUNPOWDER |
| 25R | WATER AND HYDROCARBON |
| 25A | Water in charge |
| 25B | Water plus heat into charge |
| 25C | Water into cylinder |
| 25D | Water plus heat into charge |
| 25E | Water introduced by mixing with other materials |
| 25F | Water plus heat by mixing with other materials |
| 25G | Washers and cleaners |
| 25H | Washers and cleaners with heat |
| 25J | Automatic water control |
| 25K | Automatic water control; thermostatic |
| 25L | Automatic water control; suction |
| 25M | Automatic water control; speed |
| 25N | Automatic water control interconnected with throttle |
| 25P | Steam injection |
| 25Q | Cooling regulation |
| 26 | ADDITIONAL AIR SUPPLY |
| 250 | ENGINE MEANS HAVING INTERNAL VAPORIZING IN PRECHAMBER WITH ALL COMBUSTION IN MAIN CHAMBER |
| 253 | PRECOMBUSTION AND MAIN COMBUSTION CHAMBERS IN SERIES |
| 254 | Chamber temperature control means |
| 255 | Vaporizing in precombustion chamber |
| 256 | Plural precombustion chambers |
| 257 | Two-cycle |
| 258 | Having timed valves to precombustion and main combustion chambers |
| 259 | Having volumetric relation between precombustion and main combustion chambers |
| 260 | With ignition means particularly positioned relative to precombustion and main combustion chambers |
| 261 | With injection means particularly positioned relative to precombustion and main combustion chambers |
| 262 | Having fluid whirling means |
| 264 | Precombustion chamber is carried by a valve |
| 265 | Precombustion and main chambers form an "I" head |
| 266 | Precombustion chamber assembly inserted in spark plug hole |
| 268 | Valveless precombustion chamber |
| 269 | Piston shape complements precombustion chamber discharge |
| 270 | Precombustion chamber liner or coating |
| 273 | Precombustion chamber mounting means |
| 274 | Having combustible mixture forming means |
| 279 | Piston carried precombustion chamber |
| 280 | Atomizer, deflector, or shield in precombustion chamber |