Hierarchy/Derived subclasses
| 452 / 71 | -> 86 | -> 87 | -> 88 | -> 89 | -> 90 |
| -> 91 | |||||
| -> 92 | |||||
| -> 93 |
uspto searches
Patent Apps in 452/87Granted Patents in 452/87
Use the links above or do an advanced search in ppubs for:
(452/87.ccls. or 452/88.ccls. or 452/89.ccls. or 452/90.ccls. or 452/91.ccls. or 452/92.ccls. or 452/93.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.