|D19 / 20||-> 21||-> 22||-> 3|
uspto searchesPatent Apps in D19/22
Granted Patents in D19/22
Advanced search in patft or appft for the hierarchy would be:
(ccl/D19/22 or ccl/D19/3)
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.