(under subclass 18) Subject matter in which the conductive envelope portion of the lamp or discharge device is cylindrical in form and is designed for use as one of the electrodes of the device.
(1) Note. Many of the devices in this subclass are discharge devices such as are used as the transmitting tube in radio transmitting systems.
SEE OR SEARCH THIS CLASS, SUBCLASS:
246+, for discharge devices which are provided with a cylindrical conductive envelope portion (e.g., anode) and means to support one or more electrodes (e.g., cathode, grid) within the conductive envelope portion usually by means of the closure for the cylindrical envelope portion.
317+, and the subclasses specified in the notes thereto for other lamps and discharge devices under the class definition
in which an electrode forms a portion of the envelope.
