Hierarchy/Derived subclasses
977 / 840 | -> 890 | -> 891 |
uspto searches
Patent Apps in 977/891Granted Patents in 977/891
Use the links above or do an advanced search in ppubs for:
(977/891.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.