Hierarchy/Derived subclasses
| 99 / 324 | -> 419 | -> 421r | -> 421a | |
| -> 421h | -> 421hh | |||
| -> 421hv | ||||
| -> 421m | ||||
| -> 421p | ||||
| -> 421tp | ||||
| -> 421v |
uspto searches
Patent Apps in 99/421rGranted Patents in 99/421r
Use the links above or do an advanced search in ppubs for:
(99/421r.ccls. or 99/421a.ccls. or 99/421h.ccls. or 99/421hh.ccls. or 99/421hv.ccls. or 99/421m.ccls. or 99/421p.ccls. or 99/421tp.ccls. or 99/421v.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.