Electric resistance heating devices – Heating devices – Radiant heater
Patent
1990-11-13
1992-10-20
Reynolds, Bruce A.
Electric resistance heating devices
Heating devices
Radiant heater
392407, 313112, 313579, 313572, 313634, 313580, 219553, H05B 310
Patent
active
051577585
ABSTRACT:
A tungsten halogen lamp producing infra red radiation, for example for cooking or heating, has an envelope of high silica content material sealed at each end by a pinch seal. A gas fill is at a room temperature pressure of 250-750 mm Hg. A portion of the envelope at each end is clear and the rest contains an opacifier which reduces transmission of visible light. A suitable opacifier is red, being produced by the reduction of copper oxide dispersed in the high silica content material. The envelope is produced by butt joining clear end sections and a tube of material containing opacifier.
REFERENCES:
patent: 2864025 (1958-12-01), Foote et al.
patent: 2918595 (1959-12-01), Cressman
patent: 3258631 (1966-06-01), Elmer
patent: 4426570 (1984-01-01), Hikino et al.
patent: 4598194 (1986-07-01), Halberstadt et al.
Soviet Inventions Illustrated, week 9011, Apr. 25, 1990, Derwent Publications Ltd., London, Great Britain.
SU-A-1483 507 (Moscow Fine Chem.); May 30. 1989 *Abstract*.
Halberstadt Alex L.
Letchford John A.
Reynolds Bruce A.
Switzer Michael D.
Thorn Emi plc
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