(19)
(11) EP 1 172 778 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.03.2003 Bulletin 2003/10

(43) Date of publication A2:
16.01.2002 Bulletin 2002/03

(21) Application number: 01306004.1

(22) Date of filing: 12.07.2001
(51) International Patent Classification (IPC)7: G08B 13/14, G08B 21/02
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 15.07.2000 GB 0017334

(71) Applicants:
  • Belk, Jonathan Simon
    Calver Bridge, Hope Valley S32 3XA (GB)
  • Wood, Victor
    Swalincote, Derbyshire DE11 7EX (GB)

(72) Inventors:
  • Belk, Jonathan Simon
    Calver Bridge, Hope Valley S32 3XA (GB)
  • Wood, Victor
    Swalincote, Derbyshire DE11 7EX (GB)

(74) Representative: Middlemist, Ian Alastair et al
Wilson Gunn M'Caw, 41-51 Royal Exchange, Cross Street
Manchester, M2 7BD
Manchester, M2 7BD (GB)

   


(54) Security alert apparatus


(57) Security alert apparatus comprises a receiver unit 11, and one or more transmitter units. Each transmitter unit is programmed to emit signals in 20-30 msec bursts at 3-4 second intervals, the signals being 20-bit or greater randomly generated pseudo-unique identification codes. The receiver unit is initialised to learn the codes, and then compares codes contained in signal bursts with learned and stored codes.
If any learned code is not detected within a prescribed period (greater than the burst repeat interval) an alarm is generated. The transmitter units may be fixed to articles of property or to children to guard against mislaying, theft, straying, or abduction.






Search report