Hierarchy/Derived subclasses
253 / 1 | -> 28 | -> 53 |
CIPO search
search just 253/53This 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.
Intellectual Property from a Historical Perspective
253 / 1 | -> 28 | -> 53 |