Alarm system

• US 3,404,393 A
• Filed: 04/01/1965
• Issued: 10/01/1968
• Est. Priority Date: 04/01/1965
• Status: Expired due to Term

• Current Assignee: David J. Cohen, Sidney L. Blivice
• Original Assignee: David J. Cohen, Sidney L. Blivice
• Inventors: Blivice, Sidney L., Cohen, David J.
• Application Number:
  US04/444,568
• Time in Patent Office: 1,279 Days
• US Class Current: 379/44
• CPC Class Codes: G08B 13/08 by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
• CPC Class Codes: G08B 25/06 using power transmission lines

Claims

1. IN A BUILDING OR THE LIKE INCLUDING A NUMBER OF SECTIONS HAVING A FIRST COMMON LINE EXTENDING THEREBETWEEN AND FORMING PART OF A FIRST COMMON CIRCUIT, A SECOND COMMON LINE EXTENDING BETWEEN SAID BUILDING SECTIONS AND FORMING PART OF A SECOND COMMON CIRCUIT AND AN INDIVIDUAL LINE EXTENDING TO EACH SECTION OF THE BUILDING AND COMPLETING AN INDIVIDUAL CIRCUIT ASSOCIATED WITH THE BUILDING SECTION, AND POWER SUPPLY MEANS FOR PROVIDING ENERGIZING POWER ON SAID COMMON AND INDIVIDUAL LINES FOR SAID CIRCUITS, THE IMPROVEMENT COMPRISING A MONITORING SYSTEM SUPERIMPOSED ON SAID COMMON AND INDIVIDUAL LINES FOR MONITORING A GIVEN CONDITION IN EACH SECTION OF THE BUILDING COMPRISING:

A SEPARATE CONDITION SENSING SWITCH MEANS FOR EACH SECTION OF THE BUILDING OPERATED TO AN ALARM CONDITION WHEN THE CONDITION TO BE MONITORED IS PRESENT IN THE ASSOCIATED BUILDING SECTION;

A PREPARING SWITCH MEANS FOR EACH SECTION OF THE BUILDING HAVING AN ALARM PREPARING AND AN ALARM DISABLING CONDITION;

CONTROL SIGNAL GENERATING MEANS FOR APPLYING A FIRST CONTROL SIGNAL HAVING A FIRST DISTINGUISHING CHARACTERISTIC TO SAID FIRST COMMON LINE AND A SECOND CONTROL SIGNAL HAVING A SECOND DISTINGUISHING CHARACTERISTIC TO SAID SECOND COMMON LINE;

MEANS COUPLING EACH OF SAID SEPARATE CONDITION SENSING SWITCH MEANS BETWEEN SAID FIRST COMMON LINE AND THE INDIVIDUAL LINE EXTENDING TO THE ASSOCIATED BUILDING SECTION FOR PROVIDING ON THE INDIVIDUAL LINE INVOLVED SAID FIRST CONTROL SIGNAL ONLY WHEN THE ASSOCIATED CONDITION SENSING SWITCH MEANS IS IN ITS ALARM CONDITION;

MEANS COUPLING EACH PREPARING SWITCH MEANS BETWEEN AND SECOND COMMON LINE AND THE INDIVIDUAL LINE EXTENDING TO THE ASSOCIATED BUILDING SECTION FOR PROVIDING ON THE INDIVIDUAL LINE INVOLVED SAID SECOND CONTROL SIGNAL ONLY WHEN THE PREPARING SWITCH MEANS IS IN ITS ALARM PREPARING CONDITION;

AND CONTROL SIGNAL RESPONSIVE ANNUNCIATOR MEANS RESPONSIVE ONLY TO THE COMBINED PRESENCE OF SAID FIRST AND SECOND CONTROL SIGNALS ON ANY OF AND INDIVIDUAL LINES FOR SIGNALLING AN ALARM FOR THE SECTION OF THE BUILDING INVOLVED.