|D8 / 14||-> 90||-> 91||-> 92|
uspto searchesPatent Apps in D8/91
Granted Patents in D8/91
Advanced search in patft or appft for the hierarchy would be:
(ccl/D8/91 or ccl/D8/92 or ccl/D8/93)
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.