Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 297/16.1Granted Patents in 297/16.1
Use the links above or do an advanced search in ppubs for:
(297/16.1.ccls. or 297/16.2.ccls. or 297/17.ccls. or 297/18.ccls. or 297/19.ccls. or 297/20.ccls. or 297/21.ccls. or 297/22.ccls. or 297/23.ccls. or 297/24.ccls. or 297/25.ccls. or 297/26.ccls. or 297/27.ccls. or 297/28.ccls. or 297/29.ccls. or 297/30.ccls. or 297/31.ccls. or 297/32.ccls. or 297/33.ccls. or 297/34.ccls. or 297/35.ccls. or 297/36.ccls. or 297/37.ccls. or 297/38.ccls. or 297/39.ccls. or 297/40.ccls. or 297/41.ccls. or 297/42.ccls. or 297/43.ccls. or 297/44.ccls. or 297/45.ccls. or 297/46.ccls. or 297/47.ccls. or 297/48.ccls. or 297/49.ccls. or 297/50.ccls. or 297/51.ccls. or 297/52.ccls. or 297/53.ccls. or 297/54.ccls. or 297/55.ccls. or 297/56.ccls. or 297/57.ccls. or 297/58.ccls. or 297/59.ccls. or 297/60.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.