Hierarchy/Derived subclasses
| 977 / 902 | -> 904 | -> 931 |
uspto searches
Patent Apps in 977/931Granted Patents in 977/931
Use the links above or do an advanced search in ppubs for:
(977/931.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.