US PATENT SUBCLASS 378 / 121
.~ Electron tube

Current as of: June, 1999
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378 /   HD   X-RAY OR GAMMA RAY SYSTEMS OR DEVICES

119  DF  SOURCE {3}
121.~ Electron tube {12}
122  DF  .~.~> Field emisssion or cold cathode
123  DF  .~.~> Vacuum control
124  DF  .~.~> With plural targets or anodes
125  DF  .~.~> With movable target {4}
134  DF  .~.~> With plural cathodes or heaters
135  DF  .~.~> With movable electrode
136  DF  .~.~> With specific cathode
137  DF  .~.~> With electron scanning or deflecting means
138  DF  .~.~> With electron focusing or intensity control means
139  DF  .~.~> With potential stress distribution
140  DF  .~.~> With X-ray window or secondary radiation screen
141  DF  .~.~> With cooling means {1}

DEFINITION

Classification: 378/121

Electron tube:

(under subclass 119) Subject matter wherein the source is an electronic discharge device.

(1) Note. A typical X-ray tube includes an envelope within which are positioned a filament used to heat a cathode which emits a beam of electrons which strikes a target which target then emits X-rays.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices, appropriate subclasses for non-X-ray electron tubes.