Patents : Silent alarm

时间:2019-02-27 04:10:02166网络整理admin

By Barry Fox JEFFREY WOOLF of London is patenting (WO 97/08025) a silent car alarm. The main feature is a windscreen made from an electrochromatic material, which changes from clear to opaque when an electric current passes through it. Anyone trying to hot-wire the car will trip a sensor and find that they cannot see through the windscreen. Woolf suggests the windscreen could be patterned to display a “stolen” message. Alternatively, the car could be designed to have an opaque windscreen when it is parked. To clear the screen,