Method and apparatus for forming discrete microcavities in a...

Metal deforming – By shot-blasting

Reexamination Certificate

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C451S038000

Reexamination Certificate

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07040130

ABSTRACT:
A microcavity forming device is provided for making microcavities in a tungsten wire. The microcavity forming device includes a source of particles; a housing for receiving a heated tungsten wire; and a plurality of jet nozzles disposed in the housing for spraying the particles toward the heated tungsten wire. The particles are 0.35–0.75 micron in diameter. The heated tungsten wire is received in the housing and the jet nozzles spray the particles toward the tungsten wire to form the microcavities in the tungsten wire.

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Waymouth, John F., “Where Will the Next Generation of Lamps Come From?”, Sep. 10-14, 1989; Presented at the Fifth International Symposium on the Science and Technology of All Light Sources; York, England.
H. Craighead et al., Selectively Emissive Refractory Metal Surfaces, 38 Applied Physics Letters 74, 1981.
J. Waymouth, Where Will the Next Generation of Lamps Come From?, Fifth International Symposium on the Science and Technology of all Light Sources, Sep. 10-14, 1989, pp. 22-25 and Fig. 20, York, England.

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