USPC Class Details

Description: 44 fuel and related compositions / 44 fuel and related compositions/(300) liquid fuels (excluding fuels that are exclusively mixtures of liquid hydrocarbons)

Hierarchy/Derived subclasses

44 / 300-> 301-> 302
 -> 303
 -> 304
 -> 305
 -> 306
 -> 307-> 308
 -> 309-> 310
 -> 311
 -> 312
 -> 313
 -> 314-> 315
  -> 316
  -> 317
  -> 318-> 319
 -> 320
 -> 321
 -> 322
 -> 323-> 324-> 325
   -> 326
 -> 327-> 328
 -> 329-> 330-> 331
   -> 332
  -> 333-> 334
   -> 335-> 336
   -> 337
   -> 338
   -> 339
  -> 340-> 341
   -> 342-> 343
    -> 344
    -> 345
   -> 346
   -> 347-> 348
  -> 349
  -> 350-> 351
   -> 352
  -> 353
 -> 354-> 355-> 356
  -> 357
  -> 358-> 359-> 360
   -> 361
   -> 362
   -> 363-> 364
   -> 365
   -> 366
   -> 367
   -> 368
 -> 369
 -> 370-> 371
  -> 372
  -> 373
  -> 374
 -> 375-> 376-> 377
  -> 378
  -> 379
  -> 380-> 381
  -> 382
 -> 383
 -> 384
 -> 385-> 386
  -> 387
  -> 388-> 389-> 390
    -> 391-> 392
    -> 393-> 394
     -> 395
     -> 396
    -> 397
    -> 398
   -> 399
   -> 400
   -> 401-> 402
  -> 403-> 404
  -> 405-> 406-> 407
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  -> 410
  -> 411
 -> 412-> 413-> 414
  -> 415
  -> 416
  -> 417
  -> 418-> 419
  -> 420-> 421
  -> 422
  -> 423
  -> 424-> 425
  -> 426-> 427-> 428
   -> 429
   -> 430-> 431
  -> 432-> 433
  -> 434
 -> 435
 -> 436-> 437-> 438
   -> 439
  -> 440
  -> 441
  -> 442
  -> 443-> 444
   -> 445
  -> 446
  -> 447-> 448-> 449
  -> 450
  -> 451-> 452
   -> 453
 -> 454-> 455
 -> 456
 -> 457-> 458
 -> 459

uspto searches

Patent Apps in 44/300

Granted Patents in 44/300

Use the links above or do an advanced search in ppubs for:
(44/300.ccls. or 44/301.ccls. or 44/302.ccls. or 44/303.ccls. or 44/304.ccls. or 44/305.ccls. or 44/306.ccls. or 44/307.ccls. or 44/308.ccls. or 44/309.ccls. or 44/310.ccls. or 44/311.ccls. or 44/312.ccls. or 44/313.ccls. or 44/314.ccls. or 44/315.ccls. or 44/316.ccls. or 44/317.ccls. or 44/318.ccls. or 44/319.ccls. or 44/320.ccls. or 44/321.ccls. or 44/322.ccls. or 44/323.ccls. or 44/324.ccls. or 44/325.ccls. or 44/326.ccls. or 44/327.ccls. or 44/328.ccls. or 44/329.ccls. or 44/330.ccls. or 44/331.ccls. or 44/332.ccls. or 44/333.ccls. or 44/334.ccls. or 44/335.ccls. or 44/336.ccls. or 44/337.ccls. or 44/338.ccls. or 44/339.ccls. or 44/340.ccls. or 44/341.ccls. or 44/342.ccls. or 44/343.ccls. or 44/344.ccls. or 44/345.ccls. or 44/346.ccls. or 44/347.ccls. or 44/348.ccls. or 44/349.ccls. or 44/350.ccls. or 44/351.ccls. or 44/352.ccls. or 44/353.ccls. or 44/354.ccls. or 44/355.ccls. or 44/356.ccls. or 44/357.ccls. or 44/358.ccls. or 44/359.ccls. or 44/360.ccls. or 44/361.ccls. or 44/362.ccls. or 44/363.ccls. or 44/364.ccls. or 44/365.ccls. or 44/366.ccls. or 44/367.ccls. or 44/368.ccls. or 44/369.ccls. or 44/370.ccls. or 44/371.ccls. or 44/372.ccls. or 44/373.ccls. or 44/374.ccls. or 44/375.ccls. or 44/376.ccls. or 44/377.ccls. or 44/378.ccls. or 44/379.ccls. or 44/380.ccls. or 44/381.ccls. or 44/382.ccls. or 44/383.ccls. or 44/384.ccls. or 44/385.ccls. or 44/386.ccls. or 44/387.ccls. or 44/388.ccls. or 44/389.ccls. or 44/390.ccls. or 44/391.ccls. or 44/392.ccls. or 44/393.ccls. or 44/394.ccls. or 44/395.ccls. or 44/396.ccls. or 44/397.ccls. or 44/398.ccls. or 44/399.ccls. or 44/400.ccls. or 44/401.ccls. or 44/402.ccls. or 44/403.ccls. or 44/404.ccls. or 44/405.ccls. or 44/406.ccls. or 44/407.ccls. or 44/408.ccls. or 44/409.ccls. or 44/410.ccls. or 44/411.ccls. or 44/412.ccls. or 44/413.ccls. or 44/414.ccls. or 44/415.ccls. or 44/416.ccls. or 44/417.ccls. or 44/418.ccls. or 44/419.ccls. or 44/420.ccls. or 44/421.ccls. or 44/422.ccls. or 44/423.ccls. or 44/424.ccls. or 44/425.ccls. or 44/426.ccls. or 44/427.ccls. or 44/428.ccls. or 44/429.ccls. or 44/430.ccls. or 44/431.ccls. or 44/432.ccls. or 44/433.ccls. or 44/434.ccls. or 44/435.ccls. or 44/436.ccls. or 44/437.ccls. or 44/438.ccls. or 44/439.ccls. or 44/440.ccls. or 44/441.ccls. or 44/442.ccls. or 44/443.ccls. or 44/444.ccls. or 44/445.ccls. or 44/446.ccls. or 44/447.ccls. or 44/448.ccls. or 44/449.ccls. or 44/450.ccls. or 44/451.ccls. or 44/452.ccls. or 44/453.ccls. or 44/454.ccls. or 44/455.ccls. or 44/456.ccls. or 44/457.ccls. or 44/458.ccls. or 44/459.ccls.)

At about 35 search terms the uspto will give you this error "Too many search terms" The 35th term is bold.

This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find patents or patent applications in those subclasses.
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