US PATENT SUBCLASS 257 / 173
.~ Device protection (e.g., from overvoltage)

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}
173.~ Device protection (e.g., from overvoltage) {1}
174  DF  .~.~> Rate of rise of current (e.g., dI/dt)

DEFINITION

Classification: 257/173

Device protection (e.g., from overvoltage):

(under subclass 107) Subject matter wherein the regenerative active junction type switching device includes means for protecting the device from destructive overloads (e.g., from operating voltage above a particular threshold level).

SEE OR SEARCH CLASS

361, Electricity: Electrical Systems and Devices,

91.1+, for overvoltage protection in safety and protection of systems and devices.