US PATENT SUBCLASS 313 / 26
.~.~.~ Integral double wall type of envelope

Current as of: June, 1999
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313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

11  DF  WITH TEMPERATURE MODIFIER {19}
17  DF  .~ Double wall, jacket or casing for envelope {5}
25  DF  .~.~ Sealed casing for envelope {1}
26.~.~.~ Integral double wall type of envelope

DEFINITION

Classification: 313/26

(under subclass 25) Subject matter in which the lamp or discharge device is provided with a double wall envelope, the envelope walls being formed as a unitary, integral body.

(1) Note. Included in this subclass are lamps and discharge devices which are provided with a double-walled envelope or an envelope and a casing where the space between the double walls or between the envelope and casing is evacuated or filled with a gas or vapor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

317+, for miscellaneous lamps and discharge devices which are provided with a double walled envelope where the heat transmitting properties of the double-wall envelope are not involved.

SEE OR SEARCH CLASS

215, Bottles and Jars, 13.1, for receptacles of the bottle or jar type made of glass or other ceramic or similar materials and having spaced walls, with the interwall space evacuated or filled with a gas or vapor for heat insulation purposes.

220, Receptacles,

2.1+, for double walled envelopes designed for use with lamps and discharge devices.