US PATENT SUBCLASS 219 / 706
.~.~.~ By ultrasonic or acoustic

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

678  DF  MICROWAVE HEATING {15}
702  DF  .~ With control system {8}
704  DF  .~.~ Load condition sensor {6}
706.~.~.~ By ultrasonic or acoustic

DEFINITION

Classification: 219/706

By ultrasonic or acoustic:

(under subclass 704) Subject matter wherein the sensing device is responsive to sound waves at or above audible frequency.

SEE OR SEARCH CLASS

73, Measuring and Testing, for measuring and testing devices.

367, Communications, Electrical: Acoustic Wave Systems and Devices, for acoustic wave communications.