(under subclass 11) Devices where the device is provided with an envelope, the envelope including a chamber having a surface which has a large heat dissipating surface for condensing vapors generated during the operation of the device.
(1) Note. Most of the devices in this subclass are mercury vapor discharge devices and the condensing surface is designed to condense the mercury vapor into its liquid state.
(2) Note. Included in this subclass are all discharge devices where the envelope is provided with any portion such as an enlarged portion or a portion located in a place which remains relatively cool during the operation of the device, where the purpose of such portion is to condense vapors and to change the vapors to either their liquid or solid state.
(3) Note. See the classification of envelopes designed for use with lamps and discharge devices which are provided with temperature modifying means. See the class definition for the classification of envelopes, per se, designed for use with electric lamps and discharge devices.
SEE OR SEARCH THIS CLASS, SUBCLASS:
17+, where the device is provided with either a double-wall or a jacket or casing for the envelope. Note especially indented subclass 20 where the device is provided with an internal temperature modifying baffle and subclasses 22+, where means are provided for circulating a fluid in contact with the envelope wall.
33, for devices within the definition of subclass 11 where the envelope of a device is provided with an internal temperature modifying baffle. 35, for discharge devices and lamps which are provided with envelopes with tubular passageways or conduits formed in the envelope and passing through the lamp near the filament or other heated portion of the device so that the conduit becomes hot and the heated air rises to draw cold air in at the bottom of the conduit.
