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US 4,451,504 AGranted
Process for applying phosphor to the aperture mask of a cathode ray tube
AssigneeNorth American Philips Consumer Electronics Corp.
InventorsAnthony V. Gallaro, Gordon T. Foreman
Life of this patent
Estimating the term…
Abstract
Fine particle size phosphors are adhered to the back of the aperture mask of a cathode ray tube by spraying a dispersion of such particles in a coating vehicle containing a temporary binder, and baking to remove the binder. The adhered phosphor is useful in providing information about the location of the scanning electron beams during tube operation.
Claims11
A process for applying phosphor to the aperture mask of cathode ray tube, the process comprising the steps of:
- (a) coating at least a portion of the mask with a composition comprising a dispersion of fine particle size phosphor in a binder-containing coating vehicle;
- and
- (b) baking the aperture mask to remove the vehicle and leave an adherent phosphor layer on the mask.
Dependencies are inferred from the claim text.