Hierarchy/Derived subclasses
439 / 55 | -> 65 | -> 68 | -> 69 | ||
-> 70 | -> dip | -> 71 | |||
-> 72 | |||||
-> 73 |
uspto searches
Patent Apps in 439/68Granted Patents in 439/68
Use the links above or do an advanced search in ppubs for:
(439/68.ccls. or 439/69.ccls. or 439/70.ccls. or 439/dip.ccls. or 439/71.ccls. or 439/72.ccls. or 439/73.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.