US PATENT SUBCLASS 250 / 214 VT
.~.~.~.~.~ Vacuum tube type

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
206  DF  .~ Photocell controlled circuit {9}
214 R  DF  .~.~ Special photocell or electron tube circuits {15}
214 A  DF  .~.~.~ Amplifier type {1}
214 LA  DF  .~.~.~.~ Light amplifier type {2}
214 VT.~.~.~.~.~ Vacuum tube type

Unofficial Alpha Subclasses: R P D A LA LS VT PR SG AG AL B C DC RC SF SW

DEFINITION

Classification: 250/214

(under subclass 206) Subject matter including means to electrically connect a particular photocell or electron tube with one or more electrical or electronic devices in a closed or closable electrically conducting path.

SEE OR SEARCH THIS CLASS, SUBCLASS:

315, Electric Lamp and Discharge Devices: Systems, subclasses 10+ for photocell circuits in which the photocell controls a cathode-ray tube or in which the photocell is part of a cathode-ray tube, and subclasses 149+ for photocell circuits in which the photocell controls a lamp or gas or vapor discharge device.

SEE OR SEARCH CLASS

330, Amplifiers, appropriate subclasses, particularly

59, for light controlled or light activated devices.