Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 194/261Granted Patents in 194/261
Use the links above or do an advanced search in ppubs for:
(194/261.ccls. or 194/262.ccls. or 194/263.ccls. or 194/264.ccls. or 194/265.ccls. or 194/266.ccls. or 194/267.ccls. or 194/268.ccls. or 194/269.ccls. or 194/270.ccls. or 194/271.ccls. or 194/272.ccls. or 194/273.ccls. or 194/274.ccls. or 194/275.ccls. or 194/276.ccls. or 194/277.ccls. or 194/278.ccls. or 194/279.ccls. or 194/280.ccls. or 194/281.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.