(under subclass 567) Subject matter wherein the composition of the envelope is significantly recited.
(1) Note. Here discharge devices including lamps and electronic devices are classified.
(2) Note. Envelopes defined only by composition will be found in the appropriate composition class. Also see the class definition.
SEE OR SEARCH THIS CLASS, SUBCLASS:
110+, for a special ray transmissive envelope formed of a specific composition having optical properties, particularly subclass 112 where the envelope wall includes a polarizing composition or a light filtering material, subclasses 113+ wherein the envelope has material which has light reflecting properties, subclass 116 wherein the envelope has light diffusing material and subclass 117 wherein the envelope has material with light valve properties or light obscuring properties.
317, for an envelope of the lamp or discharge device with electrical lamp or discharge device structure or there is some significance in the use of the envelope in a lamp or discharge device.
480, for an envelope composition of a cathode-ray tube.
SEE OR SEARCH CLASS 501, Compositions: Ceramic,
54, for a glass composition containing greater than ninety per cent silica.
