Hierarchy/Derived subclasses
| 311 / 1 | -> 13 | -> 27 | -> 28 | -> 29 |
CIPO searches
search just 311/28- or -
search hierarchy!
The "search hierarchy!" link will execute this search:
((311/28 <IN> CPC) <OR> (311/29 <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.