Hierarchy/Derived subclasses
521 / 50 | -> 134 | -> 135 |
-> 136 | ||
-> 137 | ||
-> 138 | ||
-> 139 | ||
-> 140 |
uspto searches
Patent Apps in 521/134Granted Patents in 521/134
Use the links above or do an advanced search in ppubs for:
(521/134.ccls. or 521/135.ccls. or 521/136.ccls. or 521/137.ccls. or 521/138.ccls. or 521/139.ccls. or 521/140.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.