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Hot-box detector alarm circuit

  • US 3,108,772 A
  • Filed: 03/14/1960
  • Issued: 10/29/1963
  • Est. Priority Date: 03/14/1960
  • Status: Expired due to Term
First Claim
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2. A HOT-BOX DETECTING SYSTEM COMPRISING PLURAL HEAT SENSOR MEANS TO PRODUCE ELECTRICAL SIGNALS RESPECTIVELY IN RESPONSE TO INCIDENT RADIANT ENERGY AND ADAPTED TO BE MOUNTED ON OPPOSITE SIDES OF A RAILROAD TRACK, RATIO FORMING MEANS COUPLED TO THE RESPECTIVE OUTPUTS OF SAID PLURAL HEAT SENSOR MEANS TO DEVELOP AN ELECTRICAL POTENTIAL IN RESPONSE TO THE RATIO OF ELECTRICAL SIGNALS FROM A PAIR OF SAID HEAT SENSOR MEANS WHEN SAID RATIO EXCEEDS A PREDETERMINED THRESHOLD, AND MEANS RESPONSIVE TO SAID RATIO MEANS TO PRODUCE AN INDICATION WHEN SAID PREDETERMINED THRESHOLD IS ATTAINED.

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