US PATENT SUBCLASS 257 / 170
.~.~ Surface feature (e.g., guard ring, groove, mesa)

Current as of: June, 1999
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257 /   HD   ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES)

107  DF  REGENERATIVE TYPE SWITCHING DEVICE (E.G., SCR, COMFET, THYRISTOR) {19}
168  DF  .~ With means to increase breakdown voltage {2}
170.~.~ Surface feature (e.g., guard ring, groove, mesa) {1}
171  DF  .~.~.~> Edge feature (e.g., beveled edge)

DEFINITION

Classification: 257/170

Surface feature (e.g., guard ring, groove, mesa, etc.):

(under subclass 168) Subject matter wherein the means for increasing breakdown voltage includes a surface feature (e.g., a guard ring or groove or mesa).