Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 540/6Granted Patents in 540/6
Use the links above or do an advanced search in ppubs for:
(540/6.ccls. or 540/7.ccls. or 540/8.ccls. or 540/9.ccls. or 540/10.ccls. or 540/11.ccls. or 540/12.ccls. or 540/13.ccls. or 540/14.ccls. or 540/15.ccls. or 540/16.ccls. or 540/17.ccls. or 540/18.ccls. or 540/19.ccls. or 540/20.ccls. or 540/21.ccls. or 540/22.ccls. or 540/23.ccls. or 540/24.ccls. or 540/25.ccls. or 540/26.ccls. or 540/27.ccls. or 540/28.ccls. or 540/29.ccls. or 540/30.ccls. or 540/31.ccls. or 540/32.ccls. or 540/33.ccls. or 540/34.ccls. or 540/35.ccls. or 540/36.ccls. or 540/37.ccls. or 540/38.ccls. or 540/39.ccls. or 540/40.ccls. or 540/41.ccls. or 540/42.ccls. or 540/43.ccls. or 540/44.ccls. or 540/45.ccls. or 540/46.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.