Electrode materials for electric lamps and methods of...

Details Electrode materials for electric lamps and methods of... Electrode materials for electric lamps and methods of...

2005-11-30

2009-12-15

Ton, Toan (Department: 2889)

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

C313S491000, C313S572000, C313S631000, C313S637000

Reexamination Certificate

active

07633226

ABSTRACT:
An electron emissive material includes a composition including a metal oxide, where the metal oxide is at least one oxide of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc, Hf, or Zr, or any combinations thereof, where the metal oxide is present in a quantity that ranges from about 20% to 100% by weight of the total composition, where the composition is operable to emit electrons in a discharge medium in response to a thermal excitation, wherein the discharge medium under steady state operating conditions producing a total vapor pressure of less than about 2×105Pa. A lamp including an envelope, an electrode including an electron emissive material and a discharge medium, is also disclosed.

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