Hierarchy/Derived subclasses
| 68 / 3r | -> 28 | -> 31 | -> 32 | |
| -> 33 | -> 34 | |||
| -> 35 | -> 36 | |||
| -> 37 |
uspto searches
Patent Apps in 68/31Granted Patents in 68/31
Use the links above or do an advanced search in ppubs for:
(68/31.ccls. or 68/32.ccls. or 68/33.ccls. or 68/34.ccls. or 68/35.ccls. or 68/36.ccls. or 68/37.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.