Internal coating materials for a cathode ray tube which are characterized by the fact that, in order to increase the electric resistivity of the internal coating, synthetic zeolite powder with a primary particle size of 0.5 to 20 microns, and more preferably 1 to 7 microns, is used together with electrically...http://www.google.de/patents/US5147460?utm_source=gb-gplus-sharePatent US5147460 - Internal coating materials for a cathode ray tube
