US PATENT SUBCLASS 445 / 20
.~.~ Filament heating


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



445 /   HD   ELECTRIC LAMP OR SPACE DISCHARGE COMPONENT OR DEVICE MANUFACTURING

1  DF  PROCESS {13}
9  DF  .~ Generating gas or vapor within an envelope, or coating by vapor, gas, mist or smoke within the envelope {12}
20.~.~ Filament heating


DEFINITION

Classification: 445/20

Filament heating:

(under subclass 9) Method which includes supplying current to the conducting cathode, anode or grid structure of the lamp or discharge device so as to cause thermally warming.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices,

549, for electric lamps and electric space discharge devices which are provided with a getter or a gas or vapor generating material and which have combined therewith means for heating the getter or the gas or vapor generating material.