USPC Class Details

Description: 71 chemistry: fertilizers / 71 chemistry: fertilizers/(1) processes and products (31) inorganic material (32) phosphorus-containing (33) phosphates (44) heat-treatment (47) carbonates, oxides, sulfates, silicon, and halides

Hierarchy/Derived subclasses

71 / 1-> 31-> 32-> 33-> 44-> 47

uspto searches

Patent Apps in 71/47

Granted Patents in 71/47

Advanced search in patft or appft for the hierarchy would be:
(ccl/71/47)

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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.
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