|D28 / 9||-> 64.1||-> 64.4||-> 64.6|
uspto searchesPatent Apps in D28/64.6
Granted Patents in D28/64.6
Advanced search in patft or appft for the hierarchy would be:
Press the Search button below to send the query to the USPTO site. (Granted patents search)
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.