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 (167) having schottky gate (e.g., mesfet, hemt, etc.)

Hierarchy/Derived subclasses

438 / 142-> 167-> 168
  -> 169
  -> 170
  -> 171
  -> 172
  -> 173
  -> 174
  -> 175
  -> 176
  -> 177
  -> 178
  -> 179
  -> 180-> 181-> 182
    -> 183
    -> 184-> 185

uspto searches

Patent Apps in 438/167

Granted Patents in 438/167

Use the links above or do an advanced search in ppubs for:
(438/167.ccls. or 438/168.ccls. or 438/169.ccls. or 438/170.ccls. or 438/171.ccls. or 438/172.ccls. or 438/173.ccls. or 438/174.ccls. or 438/175.ccls. or 438/176.ccls. or 438/177.ccls. or 438/178.ccls. or 438/179.ccls. or 438/180.ccls. or 438/181.ccls. or 438/182.ccls. or 438/183.ccls. or 438/184.ccls. or 438/185.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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