Abstract: The Internet Probability Sample is a method for obtaining a statistically robust probability sample of a target population of substantial interest (including, but not limited to Internet Users in the United States) by employing an Internet advertising system. The Internet Probability Sample (IPS) dramatically changes the nature of survey research because unbiased estimates with measurable sampling variance are produced in significantly less time and at a greatly reduced cost over Area Probability Sample and Random Digit Dial methods. The use of this invention benefits all parties that utilize survey information, including governments, academics, non-profit organizations, businesses, and the public at large.

Abstract: A gate-controlled bidirectional switching device has two main terminals on opposite major surfaces of the device. A single gate terminal located adjacent one of the main terminals on one of the major surfaces receives a signal biased with respect to said one terminal to trigger the device into conduction. The device conducts current in either direction through the main terminals, depending on the polarity of an applied bias potential across the main terminals. By controlling the resistivities or the widths of two base regions in the device with respect to each other, a trigger current for switching the device from a nonconductive state to conduct current in the one direction is adjusted with respect to that required to switch the device to conduct current in the other direction.

Abstract: A gate-controlled bidirectional switching device has two main terminals on opposite major surfaces of the device. A single gate terminal located adjacent one of the main terminals on one of the major surfaces receives a signal biased with respect to said one terminal to trigger the device into conduction. The device conducts current in either direction through the main terminals, depending on the polarity of an applied bias potential across the main terminals. By controlling the resistivities or the widths of two base regions in the device with respect to each other, a trigger current for switching the device from a nonconductive state to conduct current in the one direction is adjusted with respect to that required to switch the device to conduct current in the other direction.