Hierarchy/Derived subclasses
| 236 / 67 | -> 68r | -> 68a |
| -> 68b | ||
| -> 68c | ||
| -> 68d |
uspto searches
Patent Apps in 236/68rGranted Patents in 236/68r
Use the links above or do an advanced search in ppubs for:
(236/68r.ccls. or 236/68a.ccls. or 236/68b.ccls. or 236/68c.ccls. or 236/68d.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.