Cathode ray tube arc suppressor coating

Claim 1

In a cathode ray tube comprised of a glass envelope having a viewing screen at one end thereof and a multi electrode electron gun formed for directing a beam of electrons to said screen at an opposite end thereof; an electrically conductive coating having a high electrical resistance disposed on the interior surface of said glass envelope and extending from said screen to said electron gun, said high electrical resistance coating having a resistance of from about 20,000 ohms to about 7 megohms and comprising a mixture of Fe 2 O 3 , K 2 SiO 3 and graphite; the final electrode of said gun being electrically connected to said coating; and an antenna getter comprised of an electrically conductive, flexible metal shaft having a proximal end and a distal end, said proximal end being connected to said final electrode and said distal end carrying a getter device, the improvement comprising: a layer of extremely high resistance material overlying a portion of said high resistance coating, said extremely high resistance coating having a resistance about 100 times greater than said high resistance coating and comprising a mixture of Fe 2 O 3 and a silicate, said getter device being in contact with said extremely high resistance layer.