US PATENT SUBCLASS 257 / 253
.~.~ Chemical (e.g., ISFET, CHEMFET)

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

213  DF  FIELD EFFECT DEVICE {6}
252  DF  .~ Responsive to non-optical, non-electrical signal {2}
253.~.~ Chemical (e.g., ISFET, CHEMFET)

DEFINITION

Classification: 257/253

Chemical (e.g., ISFET, CHEMFET):

(under subclass 252) Subject matter wherein the input is a chemical reaction or the presence of a particular chemical in

close proximity to the field effect device.