US PATENT SUBCLASS 257 / 127
.~.~.~ Guard ring or groove

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}
119  DF  .~ Bidirectional rectifier with control electrode (gate) (e.g., Triac) {9}
126  DF  .~.~ With means to separate a device into sections having different conductive polarity {1}
127.~.~.~ Guard ring or groove

DEFINITION

Classification: 257/127

Guard ring or groove:

(under subclass 126) Subject matter wherein the means to separate portions of the device having different conductive polarity is or includes a groove, or a guard ring, i.e., a pn junction region in the body of the device located and/or configured to reduce electric field strength at a given applied voltage.