Hierarchy/Derived subclasses
452 / 149 | -> 150 | -> 155 | -> 156 | -> 157 | |
-> 158 | -> 159 |
uspto searches
Patent Apps in 452/156Granted Patents in 452/156
Use the links above or do an advanced search in ppubs for:
(452/156.ccls. or 452/157.ccls. or 452/158.ccls. or 452/159.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.