(19)
(11) EP 0 403 245 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.09.1991 Bulletin 1991/39

(43) Date of publication A2:
19.12.1990 Bulletin 1990/51

(21) Application number: 90306433.5

(22) Date of filing: 13.06.1990
(51) International Patent Classification (IPC)5: G08B 17/10
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 13.06.1989 GB 8913552

(71) Applicant: THORN EMI plc
London W1R 9AH (GB)

(72) Inventors:
  • Oliver, Colin Charles
    Langley, Slough, Berkshire SL3 8EA (GB)
  • Allan,Robert Edward
    South Ruislip, Middlesex HA4 0HY (GB)

(74) Representative: Hurst, Richard Arthur Alexander et al
THORN EMI Patents Limited, Central Research Laboratories, Dawley Road
Hayes, Middlesex UB3 1HH
Hayes, Middlesex UB3 1HH (GB)


(56) References cited: : 
   
       


    (54) Smoke alarm systems


    (57) A smoke alarm system utilises a conventional smoke detector (1) for producing audible alarm signals when the presence of smoke is detected. These signals are received by a mainsborne communication means (5) which may then produce further alarm signals or transmit electrical signals over a mainsborne communication system to activate remote alarm units.







    Search report