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| Class 44 | FUEL AND RELATED COMPOSITIONS |
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![[List of Pre Grant Publications for class 44 subclass 250]](../as.gif) | ![[List of Patents for class 44 subclass 250]](../ps.gif) | 250 | FLAMELESS OR GLOWLESS |
| | 265 | SOLIDIFIED LIQUID (E.G., GEL, ETC.) |
| | 266 |  Liquid alkanol base |
| | 268 | Liquid hydrocarbon base (e.g., gasoline, etc.) |
| | 269 |  With plant derivative of unknown composition (except rosin or rosin derivatives) or carbohydrate |
| | 270 | With organic nitrogen compound |
| | 271 | With organic polymer polymerized through olefinic or acetylenic bond (e.g., methacrylate polymers, polypropylene, etc.) |
| | 272 | With organic -C(=X)X- compound, wherein the X's are the same or diverse chalcogens (e.g., aluminum carboxylates, rosin salts, etc.) |
| | 275 | CANDLE COMPOSITION |
| | 280 | SOLID CARBONACEOUS FUEL DISPERSED IN A LIQUID MEDIUM (E.G., DISPERSED COAL, COKE, CARBON POWDER, PEAT, ETC.) |
| | 300 | LIQUID FUELS (EXCLUDING FUELS THAT ARE EXCLUSIVELY MIXTURES OF LIQUID HYDROCARBONS) |
| | 301 | Emulsion fuel (e.g., water-gasoline emulsions, etc.) |
| | 303 | Oxo still bottoms containing (i.e., distillation residues from reaction product of carbon monoxide, hydrogen, and olefin) |
| | 304 | Organic compound of indeterminate structure which is a reaction product of an organic compound with sulfur halide or elemental sulfur containing |
| | 305 | Phosphosulfurized or phosphooxidized organic compound of indeterminate structure containing (i.e., reaction products of organic compounds with phosphorus sulfides or oxides) |
| | 306 | Rosin, tall oil, or derivatives thereof containing (except abietic acids or fatty acids derived therefrom) |
| | 307 | Plant or animal extract mixtures or extracts of indeterminate structure containing |
| | 309 | Organic oxidate of indeterminate composition containing (e.g., paraffin wax oxidate or petroleum oxidate, etc.) |
| | 311 | Sludge, pitch, tar, or tar distillate containing |
| | 312 | Quinone or anthraquinone containing (e.g., quinhydrone, benzoquinones, etc.) |
| | 313 | Carbohydrate containing |
| | 314 | Boron containing |
| | 315 | Phosphorus attached directly or indirectly to the boron |
| | 316 | Three carbons or three fluorines bonded directly to the boron |
| | 317 | Nitrogen attached directly or indirectly to the boron |
| | 318 | Three identical or diverse chalcogens bonded directly to the boron |
| | 320 | Silicon containing |
| | 321 | Free metal or alloy containing |
| | 322 | Containing acyclic oxygen single bonded to acyclic oxygen (i.e., peroxy compounds) |
| | 323 | Containing -X-N(=X) or -X-N(=X)(=X) bonded directly to carbon, wherein the X's are the same or diverse chalcogens (e.g., thionitrite esters, etc.) |
| | 327 | Organic azide compound, or organic compound having acyclic nitrogen double bonded to acyclic nitrogen (e.g., diazo compounds, etc.) |
| | 329 | Heterocyclic carbon compound containing a hetero ring having chalcogen or nitrogen as the only ring hetero atoms |
| | 330 | Compound of indeterminate structure prepared by reacting a heterocyclic compound of known structure |
| | 331 |  The heterocyclic compound reactant is a dicarboxylic acid anhydride (e.g., reaction product of succinic anhydride with a polyamine, etc.) |
| | 332 | The heterocyclic compound reactant is an oxirane (e.g., reaction product of epihalohydrin with amine, epoxide reactions, etc.) |
| | 333 | The hetero ring contains six members including nitrogen and carbon |
| | 334 | Chalcogen in the hetero ring |
| | 335 | Plural nitrogens in the hetero ring (e.g., piperazines, etc.) |
| | 337 | Polymer or copolymer of a vinyl pyridine |
| | 338 | Acyclic chalcogen or acyclic nitrogen bonded directly to ring carbon of the hetero ring |
| | 339 | The hetero ring is unsubstituted or hydrocarbyl substituted only, or salts thereof (e.g., pyridyl salicylate salts, isoquinoline, etc.) |
| | 340 | The hetero ring contains five members including nitrogen and carbon (e.g., pyrrolidones, porphines, etc.) |
| | 341 | Chalcogen in the hetero ring |
| | 342 | Plural nitrogens in the hetero ring (e.g., imidazolines, etc.) |
| | 343 |  At least three nitrogens in the hetero ring (e.g., triazoles, tetrazoles, etc.) |
| | 344 | Having -C(=X)-, wherein X is chalcogen or NH, attached indirectly to the hetero ring by nonionic bonding |
| | 345 | Carboxylic acid salt of the hetero ring compound, or a free carboxylic acid is present |
| | 346 | Polymeric or copolymeric compound having plural occurrences of the hetero ring (e.g., alpha-olefin maleimide copolymers, etc.) |
| | 347 | Acyclic chalcogen bonded directly to each carbon adjacent to the ring nitrogen (e.g., succinimides, etc.) |
| | 349 | The hetero ring contains six members including carbon and chalcogen (e.g., six-membered sorbitans, ketone peroxides, etc.) |
| | 350 | The hetero ring contains five members including carbon and chalcogen |
| | 351 | Acyclic chalcogen bonded directly to ring carbon of the hetero ring (e.g., five-membered lactones, anhydrides, sorbitans, etc.) |
| | 352 | Ring carbons of the hetero ring are unsubstituted or hydrocarbyl substituted only |
| | 353 | The hetero ring contains three or four members |
| | 354 | Aluminum or heavy metal, other than lead, containing |
| | 355 | Inorganic metal carbonyl compound (e.g., iron carbonyl, etc.) |
| | 357 | Inorganic compound of Zr, Cr, Cu, Zn, or Ni |
| | 358 | Organic compound containing the heavy metal or aluminum |
| | 359 | Metal carbonyl compound (e.g., cyclopentadienyl manganese tricarbonyl, etc.) |
| | 360 | Substituted or unsubstituted cyclopentadienyl manganese tricarbonyl, with an organic compound having -C(=O)O- not bonded to heavy metal or aluminum etc.) |
| | 361 | Five-membered, unsaturated carbocycle bonded directly to the heavy metal or aluminum (e.g., ferrocene, etc.) |
| | 362 | Heavy metal or aluminum complex of compounds having two -C(=X)- groups, wherein X is chalcogen, bonded to the same carbon, or enols thereof (e.g., iron acetylacetonate, etc.) |
| | 363 | Heavy metal or aluminum carboxylate salt or complex |
| | 365 | Heavy metal or aluminum sulfonate salt or complex |
| | 366 | Heavy metal or aluminum salt of organic phosphorus acid |
| | 367 | Nitrogen bonded directly or indirectly to the heavy metal or aluminum |
| | 368 | Organic compound containing arsenic, antimony, or bismuth |
| | 369 | Containing -O-S(=O)(=O)O- or -O-S(=O)O- attached directly or indirectly to carbon by nonionic bonding (e.g., sulfate esters, sulfite esters, etc.) |
| | 370 | Containing organic -S(=O)(=O)O- compound (i.e., sulfonates) |
| | 371 | Nitrogen or -C(=X)-, wherein X is chalcogen, attached indirectly to the sulfonate group by nonionic bonding |
| | 372 | Hydrazine or organic nitrogen compound salts of sulfonic acids |
| | 373 | Overbased sulfonate or carbonated alkaline earth metal sulfonate |
| | 374 | With organic -C(=O)O- compound (e.g., carboxylic acids, esters, etc.) |
| | 375 | Containing compound having phosphorus bonded directly to chalcogen and directly or indirectly to carbon by nonionic bonding (e.g., alkyl acid phosphates, etc.) |
| | 376 | Nitrogen attached to the phosphorus directly or indirectly by acyclic nonionic bonding |
| | 378 | Carbon bonded directly to the phosphorus |
| | 379 | Chalcogen or halogen attached indirectly to the phosphorus by acyclic nonionic bonding |
| | 380 | Organic nitrogen compound salt of organic phosphorus acids |
| | 382 | Phosphorus triester |
| | 383 | Containing organic -C(=X)X- compound, wherein the X's are the same or diverse chalcogens, with at least one X being sulfur |
| | 384 | Organic compound containing -NC or -CN group |
| | 385 | Containing organic -C(=O)O- compound (e.g., fatty acids, etc.) |
| | 386 | Compound of indeterminate structure prepared by reacting an organic -C(=O)O- compound |
| | 387 | Nitrogen or oxygen bonded directly to the carbon of the -C(=O)O- group (e.g., carbamic and carbonic compounds, etc.) |
| | 388 | The single bonded oxygen is bonded directly to an additional carbon, which carbon may be single bonded to any element but may be multiple bonded only to carbon (i.e., carboxylic acid esters) |
| | 389 | Plural -C(=O)O- groups attached to each other directly or indirectly by nonionic bonding (e.g., polyesters, half ester-half acid compounds, etc.) |
| | 390 | Halogen or sulfur attached indirectly to the -C(=O)O- by nonionic bonding |
| | 391 | Nitrogen attached indirectly to the -C(=O)O- by nonionic bonding |
| | 393 | Copolymer of olefinically unsaturated hydrocarbon monomer and additional monomer (e.g., ethylene-vinyl acetate copolymers, etc.) |
| | 394 |  With organic nitrogen compound |
| | 395 | With additional synthetic nonhydrocarbon polymer |
| | 396 | One of the monomers contains a benzene ring (e.g., styrene, etc.) |
| | 397 | Polymer or copolymer of nonhydrocarbon olefinically unsaturated monomers polymerized through an olefinic double bond (e.g., trimer esters, etc.) |