Hierarchy/Derived subclasses
| 334 / 71 | -> 74 | -> 75 |
| -> 76 | ||
| -> 77 |
uspto searches
Patent Apps in 334/74Granted Patents in 334/74
Use the links above or do an advanced search in ppubs for:
(334/74.ccls. or 334/75.ccls. or 334/76.ccls. or 334/77.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.