Hierarchy/Derived subclasses
| 81 / 52 | -> 54 | -> 57 | -> 57.11 | -> 57.12 |
| -> 57.13 | ||||
| -> 57.14 | ||||
| -> 57.15 | -> 57.16 | |||
| -> 57.17 | ||||
| -> 57.18 | ||||
| -> 57.19 | ||||
| -> 57.2 | ||||
| -> 57.21 | ||||
| -> 57.22 | -> 57.23 | |||
| -> 57.24 | -> 57.25 | |||
| -> 57.26 | -> 57.27 | |||
| -> 57.28 | ||||
| -> 57.29 | ||||
| -> 57.3 | ||||
| -> 57.31 |
uspto searches
Patent Apps in 81/57Granted Patents in 81/57
Use the links above or do an advanced search in ppubs for:
(81/57.ccls. or 81/57.11.ccls. or 81/57.12.ccls. or 81/57.13.ccls. or 81/57.14.ccls. or 81/57.15.ccls. or 81/57.16.ccls. or 81/57.17.ccls. or 81/57.18.ccls. or 81/57.19.ccls. or 81/57.2.ccls. or 81/57.21.ccls. or 81/57.22.ccls. or 81/57.23.ccls. or 81/57.24.ccls. or 81/57.25.ccls. or 81/57.26.ccls. or 81/57.27.ccls. or 81/57.28.ccls. or 81/57.29.ccls. or 81/57.3.ccls. or 81/57.31.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.