Electric heating – Inductive heating – With heat exchange
Reexamination Certificate
2007-04-20
2008-12-02
Leung, Philip H (Department: 3742)
Electric heating
Inductive heating
With heat exchange
C219S626000, C219S662000, C219S661000, C363S021010
Reexamination Certificate
active
07459659
ABSTRACT:
A heating circuit for heating a conductive bowl includes a voltage source; a first heating coil provided between first and second nodes and being configured to heat the conductive bowl; a second heating coil provided between the second node and a third node and being configured to heat the conductive bowl; first capacitor and first switch provided in parallel between the first node and a fourth node; and second capacitor and second switch provided in parallel between the third node and the fourth node. The first and second heating coils define a circle-like shape having a center. The first and second heating coils are configured to be aligned to each other if one of the first and second heating coils is moved with respect to a line extending through the center of the circle-like shape.
REFERENCES:
patent: 3781503 (1973-12-01), Harnden et al.
patent: 3814888 (1974-06-01), Bowers et al.
patent: 4112287 (1978-09-01), Oates et al.
patent: 5571438 (1996-11-01), Izaki et al.
patent: 5-226069 (1993-09-01), None
patent: 6-29082 (1994-05-01), None
Choi Kang Rim
Seok Kyoung Wook
I-XYS Corporation
Leung Philip H
Townsend and Townsend / and Crew LLP
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