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) (329) heterocyclic carbon compound containing a hetero ring having chalcogen or nitrogen as the only ring hetero atoms

Hierarchy/Derived subclasses

44 / 300-> 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

uspto searches

Patent Apps in 44/329

Granted Patents in 44/329

Use the links above or do an advanced search in ppubs for:
(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.)

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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