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[Search a list of Patent Appplications for class 123]  Class   123INTERNAL-COMBUSTION ENGINES
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   [List of Patents for class 123 subclass 1R]  1R           MISCELLANEOUS
    [List of Patents for class 123 subclass 1A]  1A           Subclass 1A indent level is 1 Fuels, lubricants and additives
   [List of Patents for class 123 subclass 2]  2           COMBINED DEVICES
    [List of Patents for class 123 subclass 3]  3           Subclass 3 indent level is 1 Generating plants
   [List of Patents for class 123 subclass 200]  200           ROTARY
    [List of Patents for class 123 subclass 201]  201           Subclass 201 indent level is 1 Reversible
    [List of Patents for class 123 subclass 202]  202           Subclass 202 indent level is 1 With means to control degree of compression
    [List of Patents for class 123 subclass 203]  203           Subclass 203 indent level is 1 With combusted gas treatment or handling means
    [List of Patents for class 123 subclass 204]  204           Subclass 204 indent level is 1 With compression volume means in uninterrupted communication with expansion volume means
   [List of Patents for class 123 subclass 205]  205           Subclass 205 indent level is 1 With fuel injection means
    [List of Patents for class 123 subclass 206]  206           Subclass 206 indent level is 2 And pump or control means
    [List of Patents for class 123 subclass 207]  207           Subclass 207 indent level is 2 Into intake port
    [List of Patents for class 123 subclass 208]  208           Subclass 208 indent level is 2 Into intake chamber
    [List of Patents for class 123 subclass 209]  209           Subclass 209 indent level is 2 Into prechamber
   [List of Patents for class 123 subclass 210]  210           Subclass 210 indent level is 1 With ignition means
    [List of Patents for class 123 subclass 211]  211           Subclass 211 indent level is 2 Plural
   [List of Patents for class 123 subclass 212]  212           Subclass 212 indent level is 1 With plural compression volume means
    [List of Patents for class 123 subclass 213]  213           Subclass 213 indent level is 2 In series
   [List of Patents for class 123 subclass 214]  214           Subclass 214 indent level is 1 With plural expansion volume means
    [List of Patents for class 123 subclass 215]  215           Subclass 215 indent level is 2 In series
   [List of Patents for class 123 subclass 216]  216           Subclass 216 indent level is 1 With charge treatment means
    [List of Patents for class 123 subclass 217]  217           Subclass 217 indent level is 2 Exhaust gas recirculation
    [List of Patents for class 123 subclass 218]  218           Subclass 218 indent level is 2 Rotor shape
    [List of Patents for class 123 subclass 219]  219           Subclass 219 indent level is 2 Stratification
    [List of Patents for class 123 subclass 220]  220           Subclass 220 indent level is 2 Preheating
   [List of Patents for class 123 subclass 221]  221           Subclass 221 indent level is 1 With transfer means intermediate single compression volume means and single expansion volume means
    [List of Patents for class 123 subclass 222]  222           Subclass 222 indent level is 2 Isolated charge in movable transfer element
   [List of Patents for class 123 subclass 223]  223           Subclass 223 indent level is 2 Reciprocating or oscillating compression volume means
   [List of Patents for class 123 subclass 228]  228           Subclass 228 indent level is 2 Compression volume means circumferentially disposed relative to expansion volume means
    [List of Patents for class 123 subclass 229]  229           Subclass 229 indent level is 3 Transfer means in rotor
    [List of Patents for class 123 subclass 230]  230           Subclass 230 indent level is 3 Compression volume is also expansion volume
    [List of Patents for class 123 subclass 231]  231           Subclass 231 indent level is 3 Vane
   [List of Patents for class 123 subclass 232]  232           Subclass 232 indent level is 3 Interengaging rotors
    [List of Patents for class 123 subclass 233]  233           Subclass 233 indent level is 4 Nonparallel axes
   [List of Patents for class 123 subclass 234]  234           Subclass 234 indent level is 2 Compression volume means axially disposed relative to expansion volume means
    [List of Patents for class 123 subclass 235]  235           Subclass 235 indent level is 3 Transfer means in rotor
    [List of Patents for class 123 subclass 236]  236           Subclass 236 indent level is 3 Vane
    [List of Patents for class 123 subclass 237]  237           Subclass 237 indent level is 3 Abutment
    [List of Patents for class 123 subclass 238]  238           Subclass 238 indent level is 3 Interengaging rotors
   [List of Patents for class 123 subclass 239]  239           Subclass 239 indent level is 2 Compression volume means radially disposed relative to expansion volume means
    [List of Patents for class 123 subclass 240]  240           Subclass 240 indent level is 3 Concentric
   [List of Patents for class 123 subclass 241]  241           Subclass 241 indent level is 1 With compression, combustion, and expansion in a single variable volume
    [List of Patents for class 123 subclass 242]  242           Subclass 242 indent level is 2 Planetating rotor
    [List of Patents for class 123 subclass 243]  243           Subclass 243 indent level is 2 Vane
    [List of Patents for class 123 subclass 244]  244           Subclass 244 indent level is 2 Abutment
   [List of Patents for class 123 subclass 245]  245           Subclass 245 indent level is 2 Alternately approaching and receding elements
    [List of Patents for class 123 subclass 246]  246           Subclass 246 indent level is 3 Eccentric interengaging rotors
   [List of Patents for class 123 subclass 247]  247           Subclass 247 indent level is 1 Only combustion and expansion of charge in engine
    [List of Patents for class 123 subclass 248]  248           Subclass 248 indent level is 2 Abutment
    [List of Patents for class 123 subclass 249]  249           Subclass 249 indent level is 2 Interengaging rotors
   [List of Patents for class 123 subclass 18R]  18R           OSCILLATING PISTON
    [List of Patents for class 123 subclass 18A]  18A           Subclass 18A indent level is 1 Toroidal cylinder
    [List of Patents for class 123 subclass 19]  19           LIQUID PISTON
    [List of Patents for class 123 subclass 21]  21           CONVERTIBLE CYCLE
    [List of Patents for class 123 subclass 22]  22           INTERNAL COMBUSTION AND AIR
    [List of Patents for class 123 subclass 23]  23           SOLID FUEL
   [List of Patents for class 123 subclass 24R]  24R           GUNPOWDER
    [List of Patents for class 123 subclass 24A]  24A           Subclass 24A indent level is 1 Single shot gun powder motors
   [List of Patents for class 123 subclass 25R]  25R           WATER AND HYDROCARBON
    [List of Patents for class 123 subclass 25A]  25A           Subclass 25A indent level is 1 Water in charge
    [List of Patents for class 123 subclass 25B]  25B           Subclass 25B indent level is 1 Water plus heat into charge
    [List of Patents for class 123 subclass 25C]  25C           Subclass 25C indent level is 1 Water into cylinder
    [List of Patents for class 123 subclass 25D]  25D           Subclass 25D indent level is 1 Water plus heat into charge
    [List of Patents for class 123 subclass 25E]  25E           Subclass 25E indent level is 1 Water introduced by mixing with other materials
    [List of Patents for class 123 subclass 25F]  25F           Subclass 25F indent level is 1 Water plus heat by mixing with other materials
    [List of Patents for class 123 subclass 25G]  25G           Subclass 25G indent level is 1 Washers and cleaners
    [List of Patents for class 123 subclass 25H]  25H           Subclass 25H indent level is 1 Washers and cleaners with heat
    [List of Patents for class 123 subclass 25J]  25J           Subclass 25J indent level is 1 Automatic water control
    [List of Patents for class 123 subclass 25K]  25K           Subclass 25K indent level is 1 Automatic water control; thermostatic
    [List of Patents for class 123 subclass 25L]  25L           Subclass 25L indent level is 1 Automatic water control; suction
    [List of Patents for class 123 subclass 25M]  25M           Subclass 25M indent level is 1 Automatic water control; speed
    [List of Patents for class 123 subclass 25N]  25N           Subclass 25N indent level is 1 Automatic water control interconnected with throttle
    [List of Patents for class 123 subclass 25P]  25P           Subclass 25P indent level is 1 Steam injection
    [List of Patents for class 123 subclass 25Q]  25Q           Subclass 25Q indent level is 1 Cooling regulation
    [List of Patents for class 123 subclass 26]  26           ADDITIONAL AIR SUPPLY
   [List of Patents for class 123 subclass 250]  250           ENGINE MEANS HAVING INTERNAL VAPORIZING IN PRECHAMBER WITH ALL COMBUSTION IN MAIN CHAMBER
    [List of Patents for class 123 subclass 251]  251           Subclass 251 indent level is 1 Whirling in prechamber
    [List of Patents for class 123 subclass 252]  252           Subclass 252 indent level is 1 Vaporizing by a hot surface of prechamber
   [List of Patents for class 123 subclass 253]  253           PRECOMBUSTION AND MAIN COMBUSTION CHAMBERS IN SERIES
    [List of Patents for class 123 subclass 254]  254           Subclass 254 indent level is 1 Chamber temperature control means
    [List of Patents for class 123 subclass 255]  255           Subclass 255 indent level is 1 Vaporizing in precombustion chamber
    [List of Patents for class 123 subclass 256]  256           Subclass 256 indent level is 1 Plural precombustion chambers
    [List of Patents for class 123 subclass 257]  257           Subclass 257 indent level is 1 Two-cycle
    [List of Patents for class 123 subclass 258]  258           Subclass 258 indent level is 1 Having timed valves to precombustion and main combustion chambers
    [List of Patents for class 123 subclass 259]  259           Subclass 259 indent level is 1 Having volumetric relation between precombustion and main combustion chambers
    [List of Patents for class 123 subclass 260]  260           Subclass 260 indent level is 1 With ignition means particularly positioned relative to precombustion and main combustion chambers
    [List of Patents for class 123 subclass 261]  261           Subclass 261 indent level is 1 With injection means particularly positioned relative to precombustion and main combustion chambers
   [List of Patents for class 123 subclass 262]  262           Subclass 262 indent level is 1 Having fluid whirling means
    [List of Patents for class 123 subclass 263]  263           Subclass 263 indent level is 2 Whirling in precombustion chamber only
    [List of Patents for class 123 subclass 264]  264           Subclass 264 indent level is 1 Precombustion chamber is carried by a valve
    [List of Patents for class 123 subclass 265]  265           Subclass 265 indent level is 1 Precombustion and main chambers form an "I" head
   [List of Patents for class 123 subclass 266]  266           Subclass 266 indent level is 1 Precombustion chamber assembly inserted in spark plug hole
    [List of Patents for class 123 subclass 267]  267           Subclass 267 indent level is 2 Separate fuel or combustible mixture added to precombustion chamber
    [List of Patents for class 123 subclass 268]  268           Subclass 268 indent level is 1 Valveless precombustion chamber
    [List of Patents for class 123 subclass 269]  269           Subclass 269 indent level is 1 Piston shape complements precombustion chamber discharge
   [List of Patents for class 123 subclass 270]  270           Subclass 270 indent level is 1 Precombustion chamber liner or coating
    [List of Patents for class 123 subclass 271]  271           Subclass 271 indent level is 2 With liner mounting means
    [List of Patents for class 123 subclass 272]  272           Subclass 272 indent level is 2 Including combustion catalyst liner or coating means
    [List of Patents for class 123 subclass 273]  273           Subclass 273 indent level is 1 Precombustion chamber mounting means
   [List of Patents for class 123 subclass 274]  274           Subclass 274 indent level is 1 Having combustible mixture forming means
   [List of Patents for class 123 subclass 275]  275           Subclass 275 indent level is 2 By fuel injection into precombustion or main combustion chamber
    [List of Patents for class 123 subclass 279]  279           Subclass 279 indent level is 1 Piston carried precombustion chamber
    [List of Patents for class 123 subclass 280]  280           Subclass 280 indent level is 1 Atomizer, deflector, or shield in precombustion chamber