USPC Class Details

Description: 521 synthetic resins or natural rubbers -- part of the class 520 series / 521 synthetic resins or natural rubbers -- part of the class 520 series/() synthetic resins (class 520, subclass 1) (25) ion-exchange polymer or process of preparing (30) chemically treated solid polymer (31) solid polymer derived from ethylenically unsaturated reactant only (32) treated with nitrogen-containing material

Hierarchy/Derived subclasses

521 / 25

-> 30

-> 31

-> 32

uspto searches

Patent Apps in 521/32

Granted Patents in 521/32

Use the links above or do an advanced search in ppubs for:
(521/32.ccls.)

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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