Automatic rate of rise-responsive fire protection circuit

Claim 1

A SYSTEM FOR DETECTING RATES OF CHANGE OF TEMPERATURE IN AN AREA PROTECTED FROM FIRE COMPRISING A WHEATSTONE BRIDGE CIRCUIT HAVING AT LEAST ONE OF ITS ARMS ADAPTED TO HAVE ITS RESISTANCE CHANGED BY CHANGES IN TEMPERATURE IN SAID AREA TO CHANGE THE POTENTIAL OF ONE JUNCTION OF THE BRIDGE CIRCUIT WITH RESPECT TO THE POTENTIAL OF AN OPPOSITE JUNCTION, FIRST AND SECOND MEANS CONNECTED BETWEEN SAID JUNCTIONS FOR DETECTING CHANGES IN POSTENTIAL THEREBETWEEN, SAID FIRST AND SECOND DETECTING MEANS BEING ACTUATED RESPECTIVELY BY A FIRST CHANGE IN POTENTIAL BETWEEN SAID JUNCTIONS CAUSED BY A CHANGE IN TEMPERATURE OF A LOWER ORDER OF MAGNITUDE THAN THAT WHICH WOULD BE CAUSED BY A FIRE REQUIRING DETECTION AND BY A SECOND CHANGE IN POTENTIAL THEREBETWEEN WHICH IS LARGER THAN SAID FIRST CHANGE AND WHICH IS CAUSED BY A CHANGE IN TEMPERATURE OF A GREATER ORDER OF MAGNITUDE SUCH AS WOULD BE CAUSED BY A FIRE REQUIRING DETECTION, MEANS CONNECTED BETWEEN SAID JUNCTIONS AND CONNECTED TO SAID SECOND DETECTING MEANS FOR BLOCKING ACTUATION OF SAID SECOND DETECTING MEANS, SAID BLOCKING MEANS BEING ACTUATED BY A THIRD CHANGE IN POTENTIAL BETWEEN SAID JUNCTIONS WHICH IS LARGER THAN SAID SECOND CHANGE AND WHICH IS CAUSED BY A CIRCUIT FAULT, AND MEANS CONNECTED TO SAID FIRST DETECTING MEANS AND ACTUATED BY ACTUATION THEREOF FOR DELAYING THE ACTUATING OF SAID SECOND DETECTING MEANS TO PERMIT SAID BLOCKING MEANS TO BLOCK THE ACTUATION OF SAID SECOND DETECTING MEANS UPON OCCURRENCE OF SAID THIRD CHANGE IN POTENTIAL REGARDLESS OF THE OCCURRENCE OF SAID SECOND CHANGE IN POTENTIAL, THE TIME INTERVAL OF SAID DELAY MEANS BEING GREATER THAN THE TIME INTERVAL BETWEEN THE ACTUATIONS OF SAID FIRST AND THIRD DETECTING MEANS WHEN SUCH ACTUATIONS ARE CAUSED BY A CIRCUIT FAULT.

Claim 2

A SYSTEM FOR DETECTING RATES OF CHANGE OF TEMPERATURE IN AN AREA PROTECTED FROM FIRE COMPRISING A WHEATSTONE BRIDGE CIRCUIT HAVING AT LEAST ONE OF ITS ARMS ADAPTED TO HAVE ITS RESISTANCE CHANGED BY CHANGES IN TEMPERATURE IN SAID AREA TO CHANGE THE POTENTIAL OF ONE JUNCTION OF THE BRIDGE CIRCUIT WITH RESPECT TO THE POTENTIAL OF AN OPPOSITE JUNCTION, FIRST AND SECOND MEANS CONNECTED BETWEEN SAID JUNCTIONS FOR DETECTING CHANGES IN POSTENTIAL THEREBETWEEN, SAID FIRST AND SECOND DETECTING MEANS BEING ACTUATED RESPECTIVELY BY A FIRST CHANGE IN POTENTIAL BETWEEN SAID JUNCTIONS CAUSED BY A CHANGE IN TEMPERATURE OF A LOWER ORDER OF MAGNITUDE THAN THAT WHICH WOULD BE CAUSED BY A FIRE REQUIRING DETECTION AND BY A SECOND CHANGE IN POTENTIAL THEREBETWEEN WHICH IS LARGER THAN SAID FIRST CHANGE AND WHICH IS CAUSED BY A CHANGE IN TEMPERATURE OF A GREATER ORDER OF MAGNITUDE SUCH AS WOULD BE CAUSED BY A FIRE REQUIRING DETECTION, MEANS CONNECTED BETWEEN SAID JUNCTIONS AND CONNECTED TO SAID SECOND DETECTING MEANS FOR BLOCKING ACTUATION OF SAID SECOND DETECTING MEANS, SAID BLOCKING MEANS BEING ACTUATED BY A THIRD CHANGE IN POTENTIAL BETWEEN SAID JUNCTIONS WHICH IS LARGER THAN SAID SECOND CHANGE AND WHICH IS CAUSED BY A CIRCUIT FAULT, AND MEANS CONNECTED TO SAID FIRST DETECTING MEANS AND ACTUATED BY ACTUATION THEREOF FOR DELAYING THE ACTUATING OF SAID SECOND DETECTING MEANS TO PERMIT SAID BLOCKING MEANS TO BLOCK THE ACTUATION OF SAID SECOND DETECTING MEANS UPON OCCURRENCE OF SAID THIRD CHANGE IN POTENTIAL REGARDLESS OF THE OCCURRENCE OF SAID SECOND CHANGE IN POTENTIAL, THE TIME INTERVAL OF SAID DELAY MEANS BEING GREATER THAN THE TIME INTERVAL BETWEEN THE ACTUATIONS OF SAID FIRST AND THIRD DETECTING MEANS WHEN SUCH ACTUATIONS ARE CAUSED BY A CIRCUIT FAULT.