USPC Class Details

Description: 257 active solid-state devices (e.g., transistors, solid-state diodes) / 257 active solid-state devices (e.g., transistors, solid-state diodes)/(213) field effect device (215) charge transfer device (245) structure for applying electric field into device (e.g., resistive electrode, acoustic traveling wave in channel) (246) phase structure (e.g., doping variations to provide asymmetry for 2-phase operation; more than four phases or "electrode per bit")

Hierarchy/Derived subclasses

257 / 213-> 215-> 245-> 246-> 247
    -> 248

uspto searches

Patent Apps in 257/246

Granted Patents in 257/246

Use the links above or do an advanced search in ppubs for:
(257/246.ccls. or 257/247.ccls. or 257/248.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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