Electric heating – Microwave heating – Tunnel furnace
Reexamination Certificate
2000-07-13
2001-09-25
Leung, Philip H. (Department: 3742)
Electric heating
Microwave heating
Tunnel furnace
C219S700000, C219S731000, C219S762000, C099S451000, C099SDIG014
Reexamination Certificate
active
06294773
ABSTRACT:
BACKGROUND
The current invention involves optional arrangements under the general method of microwave heating described in U.S. Pat. No. 5,771,786 (which is intended to be incorporated herein by reference), entitled “System of Cooking or Heating Food Products with Microwaves and Hot Oil,” issued on Jun. 30, 1998 hereinafter referred to as “the invention” and outlined in the current invention by the current inventor. In “the invention”, a general microwave heating is used simultaneously with hot oil heating to cook a food product rapidly. The food product is carried in an out of the region of combined microwave and hot oil heating by means of a carousel. It should be noted that the term “heating” used in the article not only means raising the temperature of a food product by heat but also means cooking a food product by means of the heating process.
SUMMARY OF THE INVENTION
The current optional arrangements includes,
(a) the use of one or more magnetrons directly underneath the foods to be cooked/heated. However, a thin layer of nonconductor, such as a glass is used to physically isolate the magnetrons from the foods while permitting the microwave energy to transmit through the nonconductor.
(b) the use of a wave-guide to transmit the microwave energy from one or more magnetrons to a surface adjacent to the food products such that the magnetrons are placed a distance away from the food products. A nonconductor is also used to isolate the waveguide from the foods.
Both arrangements of magnetrons described in (a) and (b) above ensure that the magnetrons will not be stained with grease or other food particles during the cooking/heating process.
REFERENCES:
patent: 4180718 (1979-12-01), Hanson
patent: 4246462 (1981-01-01), Meisel
patent: 4289792 (1981-09-01), Smith
patent: 4405850 (1983-09-01), Edgar
patent: 5771786 (1998-06-01), Chung
Leung Philip H.
Oathout Mark A.
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