US PATENT SUBCLASS 174 / 17.05
.~.~ Hermetic sealed envelope type (e.g., with exhaust stem)

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

8  DF  WITH FLUIDS OR VACUUM {12}
17 R  DF  .~ Boxes and housings {7}
17.05.~.~ Hermetic sealed envelope type (e.g., with exhaust stem) {3}
17.06  DF  .~.~.~> Liquid seal
17.07  DF  .~.~.~> Combined lead-in and exhaust tube
17.08  DF  .~.~.~> With electric connector

DEFINITION

Classification: 174/17.05

(under subclass 17) Boxes, housings and envelopes which are hermetically sealed.

(1) Note. Merely reciting that the envelope is provided with structure (such as the hermetic seals) to provide a hermetically sealed envelope for use with a vacuum or gas

filling will not cause classification in this or the indented subclasses. See subclasses 50.5+ for such hermetically sealed envelopes.

(2) Note. Many of the envelopes and housings in this and the indented subclasses are of the type used for electric lamps, electric space discharge devices, and similar electrical devices. See section 7 of the class definition.

(3) Note. This and the indented subclasses provide for envelopes and housings which have an evacuating stem or opening.

(4) Note. Most of the boxes, housings and envelopes in this and the indented subclasses are provided with lead-in conductors for conducting electrical energy to the device within the box, housing or envelope.

SEE OR SEARCH THIS CLASS, SUBCLASS: 9, for this subject matter where the structure includes a current conductive fluid (e.g., a liquid used as part of the lead-in structure) or where a vacuum is used (e.g., as a space around the lead-in designed to be continuously evacuated to reduce leakage of air or gas).

14, for this subject matter where the structure includes means for preserving or maintaining the character of the fluid used with the box or housing.

15.1, for this subject matter where the structure includes means for circulating, feeding or distributing a fluid or is provided with fluid type cooling means for the box or housing or the device therein.

50.5+, and the subclasses specified in the Notes thereto for the miscellaneous hermetically sealed boxes and housings in this class including those with lead- in conductors.

SEE OR SEARCH CLASS

220, Receptacles,

2.1+, for envelopes and housings for electric lamps and electric space discharge devices where no electrical structure is claimed, see indented subclass 2.2 for such envelopes and housings as are provided with an evacuating stem or opening.

313, Electric Lamp and Discharge Devices, appropriate subclasses for electric lamps and electric space discharge devices which are provided with an envelope or a housing. See especially

317+, of Class 313 and the subclasses specified in the Notes thereto. Also see section 7 of the class definition of Class 174.