USPC Class Details

Description: 454 ventilation / 454 ventilation/(1) chimney or stack (3) chimneytop or stacktop structure (e.g., cowl) (15) with rotary means in air current (e.g., fan, etc.) (18) cage-type blade set

Hierarchy/Derived subclasses

454 / 1

-> 3

-> 15

-> 18

-> 19

uspto searches

Patent Apps in 454/18

Granted Patents in 454/18

Use the links above or do an advanced search in ppubs for:
(454/18.ccls. or 454/19.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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