CPC Subgroup
H01J 17/24 Means for absorbing or adsorbing gas, e.g. by gettering
Full Title
Gas-filled discharge tubes with solid cathode (H01J25/00, H01J27/00, H01J31/00 - H01J41/00 take precedence; gas filled spark gaps H01T; Marx converters H02M7/26) > Details > Means for obtaining or maintaining the desired pressure within the tube > Means for absorbing or adsorbing gas, e.g. by gettering