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) (40) process of treating scrap or waste product containing solid organic polymer to recover a solid polymer therefrom (40.5) process of treating scrap or waste product containing at least one polymer derived from ethylenic unsaturated monomers only (41) treating rubber (or rubberlike materials) or polymer derived from a monomer having at least two ethylenic unsaturated moieties (41.5) treating with organic phosphorus-containing material

Hierarchy/Derived subclasses

521 / 40-> 40.5-> 41-> 41.5

uspto searches

Patent Apps in 521/41.5

Granted Patents in 521/41.5

Use the links above or do an advanced search in ppubs for:
(521/41.5.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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