Hierarchy/Derived subclasses
521 / 50 | -> 155 | -> 170 | -> 174 | -> 175 |
-> 176 | ||||
-> 177 |
uspto searches
Patent Apps in 521/174Granted Patents in 521/174
Use the links above or do an advanced search in ppubs for:
(521/174.ccls. or 521/175.ccls. or 521/176.ccls. or 521/177.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.