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 (225) non-electrical input responsive (e.g., light responsive imager, input programmed by size of storage sites for use as a read-only memory, etc.) (231) 2-dimensional area architecture

Hierarchy/Derived subclasses

257 / 213-> 215-> 225-> 231-> 232
    -> 233

uspto searches

Patent Apps in 257/231

Granted Patents in 257/231

Use the links above or do an advanced search in ppubs for:
(257/231.ccls. or 257/232.ccls. or 257/233.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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