Abstract: Method and apparatus for preferential heating of a material are based on exposing the material to high intensity, pulsed, non-ionizing electromagnetic radiation. The method can destroy microorganisms, sterilize packaging, or sterilize moist food. An embodiment uses microwave radiation with pulse duration of less than 0.1 second with an average power of at least 1 kW to sterilize open-ended metal can prior to packaging.

Abstract: A transistor modulator for use in a circuit for processing video and sound signals of a video game so as to produce a composite output signal for application to the antenna input of a television receiver to produce a display of such video game. The modulator comprises an MOS transistor having a source electrode, a drain electrode and two gate electrodes. The video and sound signals and a VHF carrier signal are applied to respective ones of the two gate electrodes and either of the source and drain electrodes. The MOS transistor produces the composite output signal across an impedance which is connected to the other of the source and drain electrodes.