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US 4,538,089 AGranted
Green luminescent cathode-ray tube device with improved color filtering system
AssigneeNorth American Philips Corporation
InventorBrian J. Fitzpatrick
Life of this patent
Estimating the term…
Abstract
A filtering device for removing unwanted radiation from a green luminescing CRT comprises a solution of a soluble praseodymium salt, sodium fluorescein and Fast Green FCF.
Claims15
A cathode-ray tube device for generating a bright green light spot comprising;
- a cathode-ray tube including an evacuated envelope, means, located within said envelope, to generate an electronic beam, a terbium activated phosphor, capable of emitting radiation when excited by electrons, positioned within said envelope and in the path of said electron beam and a transparent face plate forming part of said envelope is situated in the path of said green radiation, and positioned outside of the outer surface of said face plate and in the path of said green radiation, a light beam filtering means comprising in a container which at least in the path of said green radiation is transparent to said radiation, a concentrated solution of a soluble praseodymium salt, sodium fluorescein and Fast Green FCF.
Dependencies are inferred from the claim text.