US PATENT SUBCLASS 348 / 820
.~.~.~ External electric or magnetic effect

Current as of: June, 1999
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348 /   HD   TELEVISION

739  DF  VIDEO DISPLAY {13}
805  DF  .~ Cathode-ray tube {5}
818  DF  .~.~ Protective device {3}
820.~.~.~ External electric or magnetic effect

DEFINITION

Classification: 348/820

External electric or magnetic effect:

(under subclass 818) Subject matter wherein the protective device is intended to eliminate influence from a spurious magnetic field, or a stray current or voltage.

SEE OR SEARCH CLASS

315, Electric Lamp and Discharge Devices: Systems,

8, for cathode-ray tube circuits to compensate for stray deflecting fields.

361, Electricity: Electrical Systems and Devices,

150, for television degaussing.