Electrical system and method for protecting premises subject to varying ambient conditions

• US 3,074,053 A
• Filed: 03/01/1960
• Issued: 01/15/1963
• Est. Priority Date: 03/01/1960
• Status: Expired due to Term

• Current Assignee: Evans, Francis C., Howard Pearson, Vincent T. Mcdonough
• Original Assignee: Evans, Francis C., Howard Pearson, Vincent T. Mcdonough
• Inventors: Mcdonough, Vincent T., Pearson, Howard, Evans, Francis C.
• Application Number:
  US04/012,043
• Time in Patent Office: 1,050 Days
• US Class Current: 340/522
• CPC Class Codes: G08B 13/00 Burglar, theft or intruder alarms
• CPC Class Codes: G08B 13/2494 by interference with electro-magnetic field distribution combined with other electrical sensor means, e.g. microwave detectors combined with other sensor means
• CPC Class Codes: G08B 17/00 Fire alarms; Alarms responsive to explosion

Claims

12. AN ELECTRICAL PROTECTION SYSTEM FOR PROTECTING PREMISES SUBJECT TO VARYING AMBIENT CONDITIONS, COMPRISING FIRST AND SECOND ITEMS OF ELECTRICAL PROTECTION APPARATUS AT SAID PREMISES DISPOSED SO AS TO BE SUBJECT TO SAID AMBIENT CONDITIONS AND TO ALARM CONDITIONS, EACH OF SAID ITEMS INCLUDING ELECTRICAL PROTECTION MEANS TO PRODUCE AN ELECTRICAL ALARM SIGNAL UPON DETECTION OF AN ALARM CONDITION, EACH OF SAID LAST MENTIONED MEANS HAVING RESPECTIVELY DIFFERENT RESPONSE CHARACTERISTICS TO CHANGES IN AT LEAST ONE OF SAID AMBIENT CONDITIONS, AND SIGNAL RESPONSIVE MEANS ELECTRICALLY CONNECTED TO BOTH OF SAID ELECTRICAL PROTECTION MEANS, SAID SIGNAL RESPONSIVE MEANS BEING RESPONSIVE ONLY TO SUBSTANTIALLY SIMULTANEOUS PRODUCTION OF AN ALARM SIGNAL BY BOTH OF SAID ELECTRICAL PROTECTION MEANS TO TRANSMIT AN ALARM SIGNAL INDICATION.