USPC Class Details

Description: 71 chemistry: fertilizers / 71 chemistry: fertilizers/(1) processes and products (31) inorganic material (54) nitrogen-containing (except ammonium) (55) cyanamide

Hierarchy/Derived subclasses

71 / 1-> 31-> 54-> 55-> 56
    -> 57

uspto searches

Patent Apps in 71/55

Granted Patents in 71/55

Advanced search in patft or appft for the hierarchy would be:
(ccl/71/55 or ccl/71/56 or ccl/71/57)

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.