Vehicle solid state alarm system

Claim 1

AN ALARM SYSTEM FOR A VEHICLE HAVING A BODY WITH A PLURALITY OF MOVABLE CLOSURE MEMBERS OPENABLE TO THE INTERIOR OF SAID BODY, SAID SYSTEM COMPRISING IN COMBINATION: A SOURCE OF DIRECT CURRENT; AN ELECTRICALLY OPERABLE ALARM DEVICE; A SOLID STATE GATE CONTROLLED SEMICONDUCTOR TRIODE RECTIFIER HAVING AN ANODE, CATHODE AND GATING ELECTRODE; FIRST CIRCUIT MEANS CONNECTING SAID CURRENT SOURCE, ALARM DEVICE, ANODE AND CATHODE IN A FIRST SERIES CIRCUIT FOR ACTIVATING SAID ALARM DEVICE BY CURRENT PASSING THROUGH THE RECTIFIER VIA THE ANODE AND CATHODE; SAID RECTIFIER HAVING A HIGH INTERNAL ELECTRICAL RESISTANCE SO THAT THE RECTIFIER IS NORMALLY IN A NONCONDUCTIVE STATE UNLESS A VOLTAGE OF PREDETERMINED MAGNITUDE IS APPLIED AT LEAST MOMENTARILY BETWEEN SAID GATING ELECTRODE AND CATHODE TO REDUCE SAID ELECTRICAL RESISTANCE TO A LOW VALUE, SAID LOW VALUE OF ELECTRICAL RESISTANCE BEING THEN MAINTAINED SO THAT ELECTRIC CURRENT PASSES CONTINUOUSLY THROUGH THE RECTIFIER BETWEEN ANODE AND CATHODE UNTIL THE ELECTRIC CURRENT IS INTERRUPTED WHEREUPON THE HIGH ELECTRICAL RE SISTANCE AND NONCONDUCTIVE STATE OF THE RECTIFIER ARE RESTORED; A NORMALLY OPEN SWITCH ARRANGED TO BE CLOSED BY AN INTRUDER ENTERING THE VEHICLE BODY; ELECTRICAL RESISTANCE MEANS, SECOND CIRCUIT MEANS CONNECTING SAID DIRECT CURRENT SOURCE, SWITCH AND RESISTANCE MEANS IN A SECOND SERIES CIRCUIT FOR ESTABLISHING SAID VOLTAGE OF PREDETERMINED MAGNITUDE ACROSS TERMINALS OF SAID RESISTANCE MEANS WHEN THE SWITCH IS CLOSED; AND THIRD CIRCUIT MEANS CONNECTING SAID CATHODE AND GATING ELECTRODE TO THE TERMINALS RESPECTIVELY OF SAID RESISTANCE MEANS FOR APPLYING SAID PREDETERMINED VOLTAGE BETWEEN SAID GATING ELECTRODE AND CATHODE, WHEREBY THE RECTIFIER IS RENDERED CONDUCTIVE BETWEEN THE ANODE AND CATHODE TO ACTIVATE THE ALARM DEVICE WHEN SAID SWITCH IS CLOSED, AND WHEREBY THE SOLID STATE RECTIFIER REMAINS CONDUCTIVE AND ALARM DEVICE REMAINS ACTIVATED EVEN THOUGH THE SWITCH IS THEREAFTER OPENED.