US PATENT SUBCLASS 340 / 629
.~.~.~.~.~ Ionization

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
603  DF  .~.~ Fluent material {7}
627  DF  .~.~.~ Particle suspension in fluid {2}
628  DF  .~.~.~.~ Smoke {2}
629.~.~.~.~.~ Ionization

DEFINITION

Classification: 340/629

Ionization:

(under subclass 628) Subject matter wherein the smoke detector responds to ionization of the smoke caused by an applied electric field or a radioactive source.

SEE OR SEARCH CLASS

250, Radiant Energy,

381, for ionization-type signalling circuits, per se.