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 (197) having insulated gate (e.g., igfet, misfet, mosfet, etc.) (199) complementary insulated gate field effect transistors (i.e., cmos) (218) including isolation structure (225) recessed oxide formed by localized oxidation (i.e., locos) (227) having well structure of opposite conductivity type (228) plural wells

Hierarchy/Derived subclasses

438 / 142-> 197-> 199-> 218-> 225-> 227-> 228

uspto searches

Patent Apps in 438/228

Granted Patents in 438/228

Use the links above or do an advanced search in ppubs for:
(438/228.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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