A safety device includes a wire loop embedded in the glass of a passenger car window and routed near the closing leading-edge of the window. The wire loop carries microwave pulses around the loop to and from a transceiver with separate output and input ports. An evanescent field only and inch or two...http://www.google.com/patents/US5661385?utm_source=gb-gplus-sharePatent US5661385 - Window-closing safety system
