System for heating materials with electromagnetic waves

Details System for heating materials with electromagnetic waves System for heating materials with electromagnetic waves

1984-07-19

1986-05-20

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055A, 219 1055B, 299 3, 299 6, 299 14, 405131, H05B 680, E21C 3716

Patent

active

045903484

ABSTRACT:
A system for controlling microwave heaters in order to efficiently heat frozen ground. The heaters are energized and deenergized by a control unit in response to the temperature sensed a selected distance from a heater. The control unit also deenergizes the heater in response to a temperature sensed in the vicinity of the applicators of the heater in order to protect the heaters from overheating.

REFERENCES:
patent: 3230957 (1961-02-01), Seifert
patent: 3263052 (1966-07-01), Jeppson et al.
patent: 3829649 (1974-08-01), Igarashi
patent: 3980855 (1976-09-01), Boudouris et al.
patent: 3988036 (1976-10-01), Fisher et al.
patent: 4208562 (1980-06-01), Perreault
patent: 4217477 (1980-08-01), Matsubara et al.
patent: 4221948 (1980-09-01), Jean
patent: 4256944 (1981-03-01), Brandon
patent: 4370534 (1983-01-01), Brandon
patent: 4370535 (1983-01-01), Noda
patent: 4399341 (1983-08-01), Yasuoka
"Review of Thawtron.TM. Device for Thawing Frozen Coal," Mar. 1982, Prepared by SRI Intl., Menlo Park, CA; Principal Investigators W. A. Edson and G. E. Tallmadge.

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