Abstract: An apparatus for sealing a wafer in the neck of a CRT has two groups of burners, one group provides the optimum temperature for sealing, the other group provides the optimum temperature for cutting off the cullet. The burners are arranged in an arc with the outer burners performing the cutting off operation and the inner burners performing the sealing operation.

Abstract: A method is proposed for eliminating so-called halo blocked apertures in color picture cathode-ray tubes. The cathode-ray tube comprises an evacuated envelope having therein a luminescent viewing screen, an electron gun for producing at least one electron beam for exciting the screen to luminescence and an apertured mask closely spaced from the screen for selectively intercepting and transmitting portions of the electron beam. A getter is provided for coating an interior surface of the apertured mask with a gas-sorbing, conductive getter material film. The halo blocked apertures are caused by insulative negatively-charged particles attached to the interior surface of the apertured mask. The conventional tube processing includes the steps of getter flashing, cathode discharge ball gap, cathode conversion, hot shot, first low voltage age, implosion proofing, external coating, frit breakdown check, radio frequency spot knock and final low voltage age.

Abstract: In a method of making a virgin CRT (cathode-ray tube), soon after the panel and funnel are sealed together to form a bulb, the inside of the bulb is flushed with wet carbon-dioxide gas and then flushed with dry noncontaminating gas. Subsequently, the mount assembly is sealed into the funnel, and then the bulb is exhausted, sealed and gettered to produce the finished CRT.