Sheathed heating element with positive temperature coefficient

Details Sheathed heating element with positive temperature coefficient Sheathed heating element with positive temperature coefficient

2005-07-19

2005-07-19

Paik, Sang Y. (Department: 3742)

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

C219S544000

Reexamination Certificate

active

06919542

ABSTRACT:
A heating element for an electric appliance for heating or cooking foods. The heating element is composed of: a tubular metal envelope; and a resistance wire encased in an insulator disposed at the interior of the tubular envelope. The wire is composed of nickel and iron as the two principal elements, and has a temperature coefficient α greater than 1500 ppm/° C. The wire may be wound in a spiral and the outer diameter of the spiral is greater than 0.7 times the inner diameter of the tubular envelope.

REFERENCES:
patent: 2499961 (1950-03-01), Lennox
patent: 2767288 (1956-10-01), Lennox
patent: 2816200 (1957-12-01), Mudge
patent: 2916594 (1959-12-01), Sawyer
patent: 3885128 (1975-05-01), Dills
patent: 4052590 (1977-10-01), Anderl et al.
patent: 2 308 537 (1997-06-01), None

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