Hierarchy/Derived subclasses
| 74 / 813r | -> 814 | ||||
| -> 815 | |||||
| -> 816 | -> 817 | -> 818 | |||
| -> 819 | |||||
| -> 820 | |||||
| -> 821 | |||||
| -> 822 | -> 823 | -> 824 | |||
| -> 825 | |||||
| -> 826 | |||||
| -> 827 | |||||
| -> 813c | |||||
| -> 813l |
uspto searches
Patent Apps in 74/813rGranted Patents in 74/813r
Use the links above or do an advanced search in ppubs for:
(74/813r.ccls. or 74/814.ccls. or 74/815.ccls. or 74/816.ccls. or 74/817.ccls. or 74/818.ccls. or 74/819.ccls. or 74/820.ccls. or 74/821.ccls. or 74/822.ccls. or 74/823.ccls. or 74/824.ccls. or 74/825.ccls. or 74/826.ccls. or 74/827.ccls. or 74/813c.ccls. or 74/813l.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.