ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS

**Definition:** This place covers:

In particular:

AC-PDP

DC-PDP

Vacuum tubes

Transit-time tubes, e.g. Klystrons, travelling wave tubes, magnetrons

Ion beam tubes

Cathode ray tubes and electron beam tubes, in particular electron emission (e.g. field emission) display panels

Discharge tubes with provision for emergence of electrons or ions from the vessel

X-ray tubes

Discharge tubes with provision for introducing objects or material to be exposed to the discharge

Photoelectric discharge tubes not involving the ionisation of gas

Discharge tubes for measuring pressure of introduced gas or for evacuation by diffusion of ions

Secondary emission tubes or electron-multiplier tubes

Discharge tubes functioning as thermionic generators

Tubes for determining the presence, intensity or energy or radiation or particles

Particle spectrometer or separator tubes

Gas- or vapour-discharge lamps

Cathode-ray or electron stream lamps, in particular flat panel electron emission lamps as LCD backlight

Lamps without any electrode inside the vessel or with at least one main electrode outside the vessel

Apparatus or processes specially adapted to the manufacture thereof

**Limiting references (this place does not cover):** - Emission spectrometry -> G01J3/443 - Spark gaps, including gas-filled spark gaps -> H01T - Electric arc lamps -> H05B31/00 - Particle accelerators -> H05H

**Glossary:** - Lamp: In this subclass, "lamp" includes tubes emitting visible, ultraviolet or infrared light. - Spark Gap: A "spark gap" is an enclosed or non-enclosed discharge device having cold electrodes and used exclusively to discharge a quantity of electrical energy in a small time duration. - Spectrometer: An instrument used to disperse radiant energy or particles into a spectrum and measure properties such as wavelength, mass, energy, or index of refraction.