USPC Class Details – HistoricIP

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 (149) on insulating substrate or layer (e.g., tft, etc.) (151) having insulated gate (152) combined with electrical device not on insulating substrate or layer

Hierarchy/Derived subclasses

438 / 142

-> 149

-> 151

-> 152

-> 153

uspto searches

Patent Apps in 438/152

Granted Patents in 438/152

Use the links above or do an advanced search in ppubs for:
(438/152.ccls. or 438/153.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.