Hierarchy/Derived subclasses
345 / 418 | -> 619 | -> 629 | -> 634 | -> 639 | -> 640 |
uspto searches
Patent Apps in 345/639Granted Patents in 345/639
Use the links above or do an advanced search in ppubs for:
(345/639.ccls. or 345/640.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.