US PATENT SUBCLASS 445 / 41
.~.~.~ By gettering

Current as of: June, 1999
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445 /   HD   ELECTRIC LAMP OR SPACE DISCHARGE COMPONENT OR DEVICE MANUFACTURING

1  DF  PROCESS {13}
23  DF  .~ With assembly or disassembly {8}
38  DF  .~.~ Including evacuating, degasifying or gas, vapor, liquid or meltable or sublimable solid introduction {5}
41.~.~.~ By gettering

DEFINITION

Classification: 445/41

By gettering:

(under subclass 38) Method which includes introducing a chemical material such as a solid or vapor to absorb, adsorb or chemically tie up undesired materials such as gases within the sealed enclosure of the lamp or device.

(1) Note. Gettering includes using materials which, when placed in the envelope, reduce the gas or vapor pressure in any manner, even though the theory of operation is not known. Gettering, therefore, includes using a reactive material which will chemically combine with the gas or vapor to form a nonvolatile compound, or to form a compound of lower vapor pressure or ionic activity. One gas may therefore be a getter for another gas. Gettering also include using materials, such as charcoal, with adsorb and absorb the gases or vapors.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9+, for methods of gettering which include generating a gas or vapor from a normally nongaseous and nonvaporous material in the envelope, the generated gas or vapor being active as a getter. Flashing magnesium is the subclasses 9+.

55, for similar subject matter which does not include any

assembly or disassembly operation.

SEE OR SEARCH CLASS

252, Compositions, for miscellaneous chemical compositions, note especially 181.11+, for getter compositions. Note also subclasses 182.11+ for chemical agents or materials.

313, Electric Lamp and Discharge Devices,

174+, for electric lamps and electric space discharge devices which are provided with a getter. Class 313 provides for such devices with a getter whether claimed prior to the use of the getter (incompletely manufactured) or subsequent to such use.

417, Pumps,

48+, for electrical or getter type devices.

420, Alloys or Metallic Compositions, appropriate subclasses for metal powder products which are alloys.

423, Chemistry of Inorganic Compounds, appropriate subclasses, for inorganic compounds and nonmetallic elements which may be useful in gettering. Also note

210+, for modifying or removing gaseous material.

502, Catalyst, Solid Sorbent, or Support Therefor: Product or Process of Making, for a composition comprising a catalyst or support therefor or sorbent of general utility.