Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 2/426Granted Patents in 2/426
Use the links above or do an advanced search in ppubs for:
(2/426.ccls. or 2/427.ccls. or 2/428.ccls. or 2/429.ccls. or 2/430.ccls. or 2/431.ccls. or 2/432.ccls. or 2/433.ccls. or 2/434.ccls. or 2/435.ccls. or 2/436.ccls. or 2/437.ccls. or 2/438.ccls. or 2/439.ccls. or 2/440.ccls. or 2/441.ccls. or 2/442.ccls. or 2/443.ccls. or 2/444.ccls. or 2/445.ccls. or 2/446.ccls. or 2/447.ccls. or 2/448.ccls. or 2/449.ccls. or 2/450.ccls. or 2/451.ccls. or 2/452.ccls. or 2/453.ccls. or 2/454.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.