Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 368/223Granted Patents in 368/223
Use the links above or do an advanced search in ppubs for:
(368/223.ccls. or 368/224.ccls. or 368/225.ccls. or 368/226.ccls. or 368/227.ccls. or 368/228.ccls. or 368/229.ccls. or 368/230.ccls. or 368/231.ccls. or 368/232.ccls. or 368/233.ccls. or 368/234.ccls. or 368/235.ccls. or 368/236.ccls. or 368/237.ccls. or 368/238.ccls. or 368/239.ccls. or 368/240.ccls. or 368/241.ccls. or 368/242.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.