USPC Class Details

Description: 523 synthetic resins or natural rubbers -- part of the class 520 series / 523 synthetic resins or natural rubbers -- part of the class 520 series/() synthetic resins (class 520, subclass 1) (1) processes of preparing a desired or intentional composition of at least one nonreactant material and at least one solid polymer or specified intermediate condensation product, or product thereof (139) composition related to metal foundry molding or metallurgical furnace or process of preparing (142) organic polyisocyanate or derived from polyisocyanate (143) phenolic, amine, or ketone condensate with aldehyde

Hierarchy/Derived subclasses

523 / 1-> 139-> 142-> 143

uspto searches

Patent Apps in 523/143

Granted Patents in 523/143

Use the links above or do an advanced search in ppubs for:
(523/143.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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