Hierarchy/Derived subclasses
44 / 300 | -> 436 | -> 451 | -> 452 |
-> 453 |
uspto searches
Patent Apps in 44/451Granted Patents in 44/451
Use the links above or do an advanced search in ppubs for:
(44/451.ccls. or 44/452.ccls. or 44/453.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.