US PATENT SUBCLASS 174 / 50.5
.~ Hermetic sealed envelope type

Current as of: June, 1999
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174 /   HD   ELECTRICITY: CONDUCTORS AND INSULATORS

50  DF  BOXES AND HOUSINGS {4}
50.5.~ Hermetic sealed envelope type {9}
50.51  DF  .~.~> With covering or casing for envelope
50.52  DF  .~.~> With electrical connector {1}
50.54  DF  .~.~> With mounting means for a device within envelope
50.55  DF  .~.~> Hollow lead surrounding another lead (e.g., concentric type)
50.56  DF  .~.~> Lead-in insulated from metal wall
50.57  DF  .~.~> Stem or sealing disk attached to envelope neck {1}
50.59  DF  .~.~> With shield for lead-in seal or between the lead-in conductors
50.6  DF  .~.~> Plural lead-in
50.61  DF  .~.~> With bonded seal for conductive member (e.g., glass to metal) {3}

DEFINITION

Classification: 174/50.5

(under subclass 50) Envelopes which are hermetically sealed.

(1) Note. The term envelope is defined to include boxes, housings or other hermetically sealed receptacles in this and the indented subclasses.

(2) Note. Many of the envelopes in this and the indented subclasses are of the type used for electric lamps, electric space discharge devices and similar electrical devices. See Lines With Other Classes, 1.,

(3) Note. Most of the envelopes in this and the indented subclasses are provided with lead-in conductors for conducting electrical energy to the device within the envelope.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9, and 17.05+, and the subclasses specified in the Notes thereto for this subject matter where a fluid is used or where the structure is provided with means peculiarly adapted for use with a fluid (e.g., an evacuating stem or opening or a fluid seal), and see subclass 9 where the structure includes a current conductive fluid or where a vacuum is used.

35, for this subject matter where the structure includes an electrostatic or electromagnetic shielding means, and for envelopes with a shield which wholly or partially surrounds the envelope.

65, for other boxes and housings under subclass 50 which are provided with means to couple a cable, wire or conduit to the box or housing.

151+, for devices (e.g., bushings) for insulating a conductor from a wall or plate through which the conductor extends (the bushing may be fluid tight).

SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers, appropriate subclasses for vacuum switches and

32, 81.6 and 152 for liquid contact (mercury switches).

220, Receptacles,

2.1+, for envelopes (including those which are hermetically sealed) for electric lamps, electric space discharge devices, and similar devices.

313, Electric Lamp and Discharge Devices,

317+, and the subclasses specified in the Notes thereto for electric lamp and electric space discharge devices which are provided with a hermetically sealed envelope. See Lines With Other Classes, 1., of the class definition of this class (174) with respect to the distinction between Classes 174 and 313.

337, Electricity: Electrothermally or Thermally Actuated Switches,

28+, for electrothermal switches with hermetically sealed housing, casing or envelope. 373, Industrial Electric Heating Furnaces,

54, 63, 110+, and 140+ for electric furnaces having a sealed gas filled or evacuated chamber.

403, Joints and Connections

179, and 265+ for miscellaneous joints between diverse materials bonded together.