USPC Class Details

Description: 131 tobacco / 131 tobacco/(329) tobacco users' appliance (330) device used for smoking (200) smoke treating (201) material separator and trap (211) chamber enclosed tubes or nipples (212.1) smoke direction changing (212.2) concentric ducts

Hierarchy/Derived subclasses

131 / 329

-> 330

-> 200

-> 201

-> 211

-> 212.1

-> 212.2

uspto searches

Patent Apps in 131/212.2

Granted Patents in 131/212.2

Use the links above or do an advanced search in ppubs for:
(131/212.2.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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