Hierarchy/Derived subclasses
68 / 3r | -> 13r | -> 19 | -> 21 | -> 22r | -> 22a |
-> 22b |
uspto searches
Patent Apps in 68/22rGranted Patents in 68/22r
Use the links above or do an advanced search in ppubs for:
(68/22r.ccls. or 68/22a.ccls. or 68/22b.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.