Coated carbon electrode having an inner coating of low resistanc

Details Coated carbon electrode having an inner coating of low resistanc Coated carbon electrode having an inner coating of low resistanc

1976-01-12

1977-01-18

Envall, Jr., R. N.

Electric lamp and discharge devices: consumable electrodes

Consumption feed type

Electrodes

H05B 3110

Patent

active

040036154

ABSTRACT:
A carbon electrode for use in an arc lamp used for determining light fastness which has a central core of light emitting material combined with stabilizers and graphite surrounded by a first coating of low resistance electrically conductive material, preferably copper or aluminum. The thus-coated core is further coated with a second coating of graphite and adhesive and inserted into a cylindrical carbon tube. The tube, except for the top and bottom portions is coated around the outside with a third protective coating, and the base and bottom portions of the tube are coated with a metallic coating electrically connected to the first coating of low resistance material spaced from the third coating. The third and fourth coatings may be joined together, provided that the resistance of these two coatings is greater than the resistance of the first coating.

REFERENCES:
patent: 3461339 (1969-08-01), Robiette et al.
patent: 3476586 (1969-11-01), Valtchev et al.
patent: 3867667 (1975-02-01), Suga

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