|71 / 1||-> 11||-> 27||-> 28||-> 29|
uspto searchesPatent Apps in 71/28
Granted Patents in 71/28
Advanced search in patft or appft for the hierarchy would be:
(ccl/71/28 or ccl/71/29 or ccl/71/30)
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.