Hierarchy/Derived subclasses
| 271 / 8.1 | -> 256 | -> 258.01 | -> 259 | -> 260 |
| -> 261 | ||||
| -> 262 | -> 263 | |||
| -> 258.02 | ||||
| -> 258.03 | ||||
| -> 258.04 | ||||
| -> 258.05 | ||||
| -> 257 |
uspto searches
Patent Apps in 271/256Granted Patents in 271/256
Use the links above or do an advanced search in ppubs for:
(271/256.ccls. or 271/258.01.ccls. or 271/259.ccls. or 271/260.ccls. or 271/261.ccls. or 271/262.ccls. or 271/263.ccls. or 271/258.02.ccls. or 271/258.03.ccls. or 271/258.04.ccls. or 271/258.05.ccls. or 271/257.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.