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 (202) filter and/or absorber (203) absorber only (no filtering)

Hierarchy/Derived subclasses

131 / 329

-> 330

-> 200

-> 201

-> 202

-> 203

-> 204

uspto searches

Patent Apps in 131/203

Granted Patents in 131/203

Use the links above or do an advanced search in ppubs for:
(131/203.ccls. or 131/204.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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