Phosphor screens for color television and method of preparing the same while using diazotype materials

Claim 1

IN THE PROCESS OF PRODUCING PHOSPHOR GLASS PLATES FOR COLOR TELEVISION TUBES, THE IMPROVEMENT IN THE ACCURATE POSITIONING OF THE PHOSPHOR DOTS ON SUCH PLATES WHICH COMPRISES EXPOSING BENEATH A PERFORATED METAL TELEVISION MASK GLASS PLATE SENSITIZED WITH A HIGH MOLECULAR WEIGHT, WATER-INSOULBLE SULFONAMIDE OF A NAPHTALENE DIAZO OXIDE, SELECTIVELY REMOVING BY SOLVENT ACTION THE PHOTODECOMPOSITION PRODUCT OF THE DIAZO OXIDE TO PRODUCE A DOT PATTERN OF EXPOSED GLASS SURROUNDED BY THE LIGHT SENSITIVE DIAZO OXIDE, APPLYING TO THE PLATE A SUSPENSION OF A PHOSPHOR IN AN ALKALI METAL SILLICATE TO CAUSE ADHESION OF THE SILLICATE AND PHOSPHOR TO THE EXPOSED GLASS AND REMOVING BY SOLVENT ACTION THE UNDECOMPOSED DIAZO OXIDE AND THE SILLICATE AND PHOSPHOR ADHERING TO SAID UNDECOMPOSED DIAZOOXIDE.