H - Electricity – 01 – K
Patent
H - Electricity
01
K
316/20, 313/172.
H01K 1/32 (2006.01) H01J 9/20 (2006.01) H01J 61/35 (2006.01)
Patent
CA 1224838
ABSTRACT OF THE DISCLOSURE An incandescent lamp, which emits infra-red radiation, comprises a tubular quartz envelope, within which a tungsten filament is supported. To reflect radiation, which is emitted in a downward direction from the filament, back in an upward direction to an item to be heated, a substantially pure aluminium oxide coating is bonded in a substantially permanent manner to the surface of the envelope. The coating extends substantially along the length of the lamp and around approximately half of the cross-sectional circumference thereof. The coating is applied to the envelope by a spray gun technique, wherein finely divided aluminium powder is blown through an oxygenated flame, which is directed towards an area of the envelope to be coated.
459830
Halberstadt Alex L.
Hume Roger A.
Ridout & Maybee Llp
Thorn Emi Plc
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