Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 194/302Granted Patents in 194/302
Use the links above or do an advanced search in ppubs for:
(194/302.ccls. or 194/303.ccls. or 194/304.ccls. or 194/305.ccls. or 194/306.ccls. or 194/307.ccls. or 194/308.ccls. or 194/309.ccls. or 194/310.ccls. or 194/311.ccls. or 194/312.ccls. or 194/313.ccls. or 194/314.ccls. or 194/315.ccls. or 194/316.ccls. or 194/317.ccls. or 194/318.ccls. or 194/319.ccls. or 194/320.ccls. or 194/321.ccls. or 194/322.ccls. or 194/323.ccls. or 194/324.ccls. or 194/325.ccls. or 194/326.ccls. or 194/327.ccls. or 194/328.ccls. or 194/329.ccls. or 194/330.ccls. or 194/331.ccls. or 194/332.ccls. or 194/333.ccls. or 194/334.ccls. or 194/335.ccls. or 194/336.ccls. or 194/337.ccls. or 194/338.ccls. or 194/339.ccls. or 194/340.ccls. or 194/341.ccls.)
At about 35 search terms the uspto will give you this error "Too many search terms" The 35th term is bold.
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.