Hierarchy/Derived subclasses
| 131 / 290 | -> 300 | -> 301 | |
| -> 302 | -> 303 | ||
| -> 304 | |||
| -> 305 | |||
| -> 306 | -> 307 | ||
| -> 308 | |||
| -> 309 | -> 310 |
uspto searches
Patent Apps in 131/300Granted Patents in 131/300
Use the links above or do an advanced search in ppubs for:
(131/300.ccls. or 131/301.ccls. or 131/302.ccls. or 131/303.ccls. or 131/304.ccls. or 131/305.ccls. or 131/306.ccls. or 131/307.ccls. or 131/308.ccls. or 131/309.ccls. or 131/310.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.