USPC Class Details

Description: 71 chemistry: fertilizers / 71 chemistry: fertilizers/(1) processes and products (11) organic material-containing (27) from synthetic material (28) urea and its derivatives

Hierarchy/Derived subclasses

71 / 1-> 11-> 27-> 28-> 29
    -> 30

uspto searches

Patent 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.