Electric thermal unit

Details Electric thermal unit Electric thermal unit

1984-03-12

1986-12-09

Goldberg, E. A.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219536, 219550, H05B 358

Patent

active

046281916

ABSTRACT:
An electric thermal unit comprises a spiral coil resistance heater incorporated in a ring-like structure formed by mutually fastened ceramic strips. This structure is surrounded by two coaxial interspaces communicating with each other at the upper region of the cylinder mounting the structure itself. In particular, cooling air is admitted into the outer interspace and may be tapped, in a heated condition, off the bottom of the inner interspace for use in subsequent processing operations.

REFERENCES:
patent: 1855092 (1932-04-01), Browne
patent: 2549944 (1951-04-01), Steiner
patent: 2614480 (1952-10-01), Elmer
patent: 2722597 (1955-11-01), Steiner
patent: 3036187 (1962-05-01), Goldstand et al.
patent: 3045097 (1962-07-01), Sellers
patent: 3548159 (1970-12-01), Ellstroem
patent: 3590206 (1971-06-01), Lago
patent: 3694628 (1972-09-01), McGwire et al.
patent: 3887790 (1975-06-01), Ferguson
patent: 4255649 (1981-03-01), Fisher

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