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) (50) cellular products or processes of preparing a cellular product, e.g., foams, pores, channels, etc. (99) cellular product formation prior to or during solid polymer formation in the presence of a stated ingredient other than water (131) ingredient contains only carbon and hydrogen atoms, only c and halogen atoms, or only c, h, and halogen atoms (132) said ingredient is substantially nonvolatile material, e.g., hydrocarbon waxes, greases, etc.

Hierarchy/Derived subclasses

521 / 50-> 99-> 131-> 132

uspto searches

Patent Apps in 521/132

Granted Patents in 521/132

Use the links above or do an advanced search in ppubs for:
(521/132.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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