|D28 / 4||-> 7||-> 2||-> 8||-> 13|
uspto searchesPatent Apps in D28/8
Granted Patents in D28/8
Advanced search in patft or appft for the hierarchy would be:
(ccl/D28/8 or ccl/D28/13)
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.