USPC Class Details

Description: 438 semiconductor device manufacturing: process / 438 semiconductor device manufacturing: process/(142) making field effect device having pair of active regions separated by gate structure by formation or alteration of semiconductive active regions (144) charge transfer device (e.g., ccd, etc.)

Hierarchy/Derived subclasses

438 / 142	-> 144	-> 145
		-> 146
		-> 147
		-> 148

uspto searches

Patent Apps in 438/144

Granted Patents in 438/144

Use the links above or do an advanced search in ppubs for:
(438/144.ccls. or 438/145.ccls. or 438/146.ccls. or 438/147.ccls. or 438/148.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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