Cathode ray tube screen and ambient light filter

Claim 1

MEANS FOR IMPROVING THE IMAGE PRESENTED BY A CATHODE RAY TUBE ADAPTED FOR COLOR TELEVISION, COMPRISING: A FILTER BODY OF TRANSPARENT MATERIAL HAVING A FORWARE FACE AND A REAR FACE; SAID FILTER BODY BEARING A PLURALITY OF FILTER ELEMENTS OF GRID FORM; EACH ELEMENT CONSTITUTING A GENERALLY PLANNER TIER OF ALTERNATING LIGHT ABSORBING AND TRANSPARENT AREAS, AND SAID TIERS BEING IN GENERALLY PARALLEL DEPTHWISE SPACED RELATION; THE CORRESPONDING AREAS OF THE GRID PATTERN IN EACH TIER BEING IN PREDETERMINED REGISTRY TO PRODUCE A MULTIPLICITY OF DEPTHWISE DIRECTED VIEWING CELLS; AND MULTIPLICITY OF PHOSPHOR DOTS SECURED TO THE REAR FACE OF SAID FILTER BODY AND ARRANGED IN IN A GEOMETRACAL PATTERN; SAID DOTS HAVING VARIED CHARACTERISTICS TO PRODUCE A MULTI-COLORED IMAGE IN OPERATION; THE LIGHT ABSORBING AREAS OF EACH OF SAID FILTER ELEMENTS COMPRISING LINES REGISTERED WITH AT LEAST PORTONS OF THE OUTLINES OF SAID DOTS; SAID FILTER BODY BEING SO FORMED AS TO BE SUBSTANTIALLY FREE OF INTERNAL REFLECTING SURFACES BETWEEN ITS FORWARD AND REAR FACES.