(under the class definition) Subject matter which includes a gas or vapor within the envelope, at least an electrode within the envelope and material of structure to release or take up gas vapor within the envelope to control the pressure of the gas or vapor within the envelope.
(1) Note. Here gas or vapor may be added or subtracted from the gas or vapor within the envelope to control the pressure or the temperature of the gas or vapor within the envelope more than one time.
(2) Note. The lamp or discharge device itself in its normal operation creates the energy which controls the material or structure to release or remove gas or vapor from the amount of gas or vapor within the lamp or discharge device.
(3) Note. Pressure control requires the ability to add or subtract gas or vapor from the gas or vapor within the envelope. The temperature of the gas or vapor determines whether gas or vapor is added to subtracted.
(4) Note. The vacuum of a vacuum tube is considered to be pressure on the gas or vapor within the envelope.
SEE OR SEARCH THIS CLASS, SUBCLASS:
11+, for a lamp or discharge device with a temperature modifier.
547+, for pressure control of gas or vapor using heating means rather than the heat evolved during the operation of the tube.
