(under subclass 567) Subject matter wherein the gas or vapor within the envelope is defined in terms of its composition.
SEE OR SEARCH THIS CLASS, SUBCLASS:
161, for a lamp or discharge device with magnetic device and a gas or vapor within lamp or device.
481, for a cathode-ray tube having a gas therein.
484+, for a lamp or discharge device having a luminescent solid or liquid and a gaseous discharge medium.
515+, for a lamp or discharge device with character display and a gaseous discharge medium.
538, for a gas phototube. 545, for a lamp or discharge device with a valve and gas or vapor generating material.
546, for a lamp or discharge device with a frangible capsule containing gas or vapor generating material.
547+, for a lamp or discharge device with heating means to control gas or vapor or gas or vapor generating means.
563, for a lamp or discharge device with gas generating material.
564+, for a lamp or discharge device with vapor generating material.
568+, for a lamp or discharge device having a particular total or partial gas or vapor pressure.
580, for incandescent lamp having a tungsten-halogen cycle.
595+, for a three or more electrode device having a gas or vapor and a heated cathode.
SEE OR SEARCH CLASS
252, Compositions,
372+, for gaseous compositions and the processes for making them.
423, Chemistry of Inorganic Compounds, 210+, for modifying or removing component of normally gaseous mixture and subclass 262 for an inert or noble gas or compound thereof, subclasses 351+ for nitrogen or compound thereof, subclasses 414+ for carbon or compound thereof and
