Hierarchy/Derived subclasses
| 420 / 513 | -> 514 | -> 515 | -> 516 |
| -> 517 | |||
| -> 518 | |||
| -> 519 | |||
| -> 520 | |||
| -> 521 | -> 522 | ||
| -> 523 | |||
| -> 524 |
uspto searches
Patent Apps in 420/513Granted Patents in 420/513
Use the links above or do an advanced search in ppubs for:
(420/513.ccls. or 420/514.ccls. or 420/515.ccls. or 420/516.ccls. or 420/517.ccls. or 420/518.ccls. or 420/519.ccls. or 420/520.ccls. or 420/521.ccls. or 420/522.ccls. or 420/523.ccls. or 420/524.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.