Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 277/500Granted Patents in 277/500
Use the links above or do an advanced search in ppubs for:
(277/500.ccls. or 277/501.ccls. or 277/502.ccls. or 277/503.ccls. or 277/504.ccls. or 277/505.ccls. or 277/506.ccls. or 277/507.ccls. or 277/508.ccls. or 277/509.ccls. or 277/510.ccls. or 277/511.ccls. or 277/512.ccls. or 277/513.ccls. or 277/514.ccls. or 277/515.ccls. or 277/516.ccls. or 277/517.ccls. or 277/518.ccls. or 277/519.ccls. or 277/520.ccls. or 277/521.ccls. or 277/522.ccls. or 277/523.ccls. or 277/524.ccls. or 277/525.ccls. or 277/526.ccls. or 277/527.ccls. or 277/528.ccls. or 277/529.ccls. or 277/530.ccls. or 277/531.ccls. or 277/532.ccls. or 277/533.ccls. or 277/534.ccls. or 277/535.ccls. or 277/536.ccls. or 277/537.ccls. or 277/538.ccls. or 277/539.ccls. or 277/540.ccls. or 277/541.ccls. or 277/542.ccls. or 277/543.ccls. or 277/544.ccls. or 277/545.ccls. or 277/546.ccls. or 277/547.ccls. or 277/548.ccls. or 277/549.ccls. or 277/550.ccls. or 277/551.ccls. or 277/552.ccls. or 277/553.ccls. or 277/554.ccls. or 277/555.ccls. or 277/556.ccls. or 277/557.ccls. or 277/558.ccls. or 277/559.ccls. or 277/560.ccls. or 277/561.ccls. or 277/562.ccls. or 277/563.ccls. or 277/564.ccls. or 277/565.ccls. or 277/566.ccls. or 277/567.ccls. or 277/568.ccls. or 277/569.ccls. or 277/570.ccls. or 277/571.ccls. or 277/572.ccls. or 277/573.ccls. or 277/574.ccls. or 277/575.ccls. or 277/576.ccls. or 277/577.ccls. or 277/578.ccls. or 277/579.ccls. or 277/580.ccls. or 277/581.ccls. or 277/582.ccls. or 277/583.ccls. or 277/584.ccls. or 277/585.ccls. or 277/586.ccls. or 277/587.ccls. or 277/589.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.