Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 70/297Granted Patents in 70/297
Use the links above or do an advanced search in ppubs for:
(70/297.ccls. or 70/298.ccls. or 70/299.ccls. or 70/300.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.