Hierarchy/Derived subclasses
| 451 / 64 | -> 177 | -> 178 | -> 212 | -> 213 | -> 214 | ||
| -> 215 | |||||||
| -> 216 | -> 217 | ||||||
| -> 218 | -> 219 | ||||||
| -> 220 | |||||||
| -> 221 | |||||||
| -> 222 | -> 223 | ||||||
| -> 224 | |||||||
| -> 225 |
uspto searches
Patent Apps in 451/213Granted Patents in 451/213
Use the links above or do an advanced search in ppubs for:
(451/213.ccls. or 451/214.ccls. or 451/215.ccls. or 451/216.ccls. or 451/217.ccls. or 451/218.ccls. or 451/219.ccls. or 451/220.ccls. or 451/221.ccls. or 451/222.ccls. or 451/223.ccls. or 451/224.ccls. or 451/225.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.