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)/(107) regenerative type switching device (e.g., scr, comfet, thyristor) (133) combined with field effect transistor (137) having controllable emitter shunt (138) having gate turn off (gto) feature

Hierarchy/Derived subclasses

257 / 107

-> 133

-> 137

-> 138

-> gto

uspto searches

Patent Apps in 257/138

Granted Patents in 257/138

Use the links above or do an advanced search in ppubs for:
(257/138.ccls. or 257/gto.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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