USPC Class Details

Description: 71 chemistry: fertilizers / 71 chemistry: fertilizers/(1) processes and products (31) inorganic material (32) phosphorus-containing (33) phosphates (37) acid treatment (40) sulfuric acid

Hierarchy/Derived subclasses

71 / 1-> 31-> 32-> 33-> 37-> 40

uspto searches

Patent Apps in 71/40

Granted Patents in 71/40

Advanced search in patft or appft for the hierarchy would be:

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.