Hierarchy/Derived subclasses
| 28 / 29 | -> 50 | -> 51 | -> 52 | -> 53 |
CIPO searches
search just 28/52- or -
search hierarchy!
The "search hierarchy!" link will execute this search:
((28/52 <IN> CPC) <OR> (28/53 <IN> CPC))
This will show what classes derive from the input. Ex: entering 78/35 shows the derived classes and the search that can be used to find patents in those subclasses.