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(11)

EP 1 800 273 A1

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(43) Date of publication: 27.06.2007 Bulletin 2007/26 (21) Application number: 05794821.8 (22) Date of filing: 08.09.2005

(51) International Patent Classification (IPC):  G08B 29/18(2006.01) G08B 13/18(2006.01) (86) International application number: PCT/US2005/031776 (87) International publication number: WO 2006/033828 (30.03.2006 Gazette 2006/13)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 16.09.2004 US 942347 (71) Applicant: SCIENTIFIC TECHNOLOGIES INCORPORATED Fremont, CA 94555-3611 (US)	(72) Inventors: LAZZARA, Joseph J. Foster City, California 94404 (US) ASHFORD, James A. Portola Valley, California 94028 (US) (74) Representative: HOFFMANN EITLE  Patent- und Rechtsanwälte Arabellastraße 4 81925 München 81925 München (DE)