Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 266/171Granted Patents in 266/171
Use the links above or do an advanced search in ppubs for:
(266/171.ccls. or 266/172.ccls. or 266/173.ccls. or 266/174.ccls. or 266/175.ccls. or 266/176.ccls. or 266/177.ccls. or 266/178.ccls. or 266/179.ccls. or 266/180.ccls. or 266/181.ccls. or 266/182.ccls. or 266/183.ccls. or 266/184.ccls. or 266/185.ccls. or 266/186.ccls. or 266/187.ccls. or 266/188.ccls. or 266/189.ccls. or 266/190.ccls. or 266/191.ccls. or 266/192.ccls. or 266/193.ccls. or 266/194.ccls. or 266/195.ccls. or 266/196.ccls. or 266/197.ccls. or 266/198.ccls. or 266/199.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.