Method of making cathode ray tube screens

Claim 1

THE METHOD OF MAKING A CATHODE RAY TUBE TARGET OF THE TYPE HAVING A PLURALITY OF DIFFERENT TARGET MATERIALS ARRANGED TO OCCUPY DIFFERENT RESPECTIVE AREAS IN A PARTICULAR PATTERN COMPRISING THE STEPS OF COATING A SUPPORT MEMBER WITH A LAYER OF A PHOTO-SENSITIVE RESIST HAVING A WATER SOLUBILITY VARYING IN ACCORDANCE WITH EXPOSURE THEREOF TO LIGHT, PHOTO-EXPOSING AND THEREBY RENDERING SELECTED AREAS OF SAID LAYER OF RESIST RELATIVELY INSOLUBLE, APPLYING A FIRST TARGET MATERIAL TO AT LEAST THE RELATIVELY NSOLUBLE AREAS OF THE RESIST, SUBJECTING TO DISSOLUTION IN WATER AND THEREBY REMOVING THE RELATIVELY SOLUBLE PORTIONS OF RESIST TOGETHER WITH ANY OF THE FIRST TARGET MATERIAL ATTACHED THERETO, COVERING AT LEAST THE RETAINED PORTIONS OF TARGET MATERIAL WITH A TEMPORARY RESIST-IMPERVOUS PROTECTIVE FILM OF GELATIN HAVING SUBSTANTIALLY LESS SOLUBILITY IN WATER OF A TEMPERATURE OF 10 TO 25*C. THAN SAID RESIST, APPLYING TO THE SUPPORT MEMBER AND OVER THE TEMPORARY PROTECTIVE FILM AN ADDITIONAL LAYER OF SAID PHOTO-SENSITIVE RESIST, PHOTO-EXPOSING AND RENDERING RELATIVELY INSOLUBLE SELECTED AREAS OF SAID ADDITIONAL RESIST, APPLYING A SECOND TARGET MATERIAL TO AT LEAST THE RELATIVELY INSOLUBLE AREAS OF SAID ADDITIONAL RESIST, REMOVING THE RELATIVELY SOLUBLE PORTIONS OF SAID ADDITIONAL RESIST TOGETHER WITH ANY SECOND TARGET MATERIAL ATTACHED THERETO BY DISOLUTION WITH WATER HAVING A TEMPERATURE OF 10 TO 25*C., AND REMOVING THE TEMPORARY PROTECTIVE GELATIN FILM FROM THE TARGET MATERIAL COVERED THEREBY BY DISSOLUTION IN WATER HAVING A TEMPERATURE OF 35 TO 50*C.

Claim 2

THE METHOD OF MAKING A CATHODE RAY TUBE TARGET OF THE TYPE HAVING A PLURALITY OF DIFFERENT TARGET MATERIALS ARRANGED TO OCCUPY DIFFERENT RESPECTIVE AREAS IN A PARTICULAR PATTERN COMPRISING THE STEPS OF COATING A SUPPORT MEMBER WITH A LAYER OF A PHOTO-SENSITIVE RESIST HAVING A WATER SOLUBILITY VARYING IN ACCORDANCE WITH EXPOSURE THEREOF TO LIGHT, PHOTO-EXPOSING AND THEREBY RENDERING SELECTED AREAS OF SAID LAYER OF RESIST RELATIVELY INSOLUBLE, APPLYING A FIRST TARGET MATERIAL TO AT LEAST THE RELATIVELY NSOLUBLE AREAS OF THE RESIST, SUBJECTING TO DISSOLUTION IN WATER AND THEREBY REMOVING THE RELATIVELY SOLUBLE PORTIONS OF RESIST TOGETHER WITH ANY OF THE FIRST TARGET MATERIAL ATTACHED THERETO, COVERING AT LEAST THE RETAINED PORTIONS OF TARGET MATERIAL WITH A TEMPORARY RESIST-IMPERVOUS PROTECTIVE FILM OF GELATIN HAVING SUBSTANTIALLY LESS SOLUBILITY IN WATER OF A TEMPERATURE OF 10 TO 25*C. THAN SAID RESIST, APPLYING TO THE SUPPORT MEMBER AND OVER THE TEMPORARY PROTECTIVE FILM AN ADDITIONAL LAYER OF SAID PHOTO-SENSITIVE RESIST, PHOTO-EXPOSING AND RENDERING RELATIVELY INSOLUBLE SELECTED AREAS OF SAID ADDITIONAL RESIST, APPLYING A SECOND TARGET MATERIAL TO AT LEAST THE RELATIVELY INSOLUBLE AREAS OF SAID ADDITIONAL RESIST, REMOVING THE RELATIVELY SOLUBLE PORTIONS OF SAID ADDITIONAL RESIST TOGETHER WITH ANY SECOND TARGET MATERIAL ATTACHED THERETO BY DISOLUTION WITH WATER HAVING A TEMPERATURE OF 10 TO 25*C., AND REMOVING THE TEMPORARY PROTECTIVE GELATIN FILM FROM THE TARGET MATERIAL COVERED THEREBY BY DISSOLUTION IN WATER HAVING A TEMPERATURE OF 35 TO 50*C.