(19)

(11)

EP 1 987 328 A2

(12)

(88) Date of publication A3: 24.04.2008 (43) Date of publication: 05.11.2008 Bulletin 2008/45 (21) Application number: 07717638.6 (22) Date of filing: 20.02.2007

(51) International Patent Classification (IPC):  G01F 23/30(2006.01) (86) International application number: PCT/US2007/062451 (87) International publication number: WO 2007/098455 (30.08.2007 Gazette 2007/35)

(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 Designated Extension States: AL BA HR MK RS (30) Priority: 17.02.2006 US 774581 P (71) Applicant: Stoneridge, Inc. Warren OH 44484 (US)	(72) Inventors: MUELLER,, Eric, C. Sarasota, FL 34235 (US) LANDMANN,, Bradley, J. Bradenton, FL 34202 (US) (74) Representative: Polypatent  Braunsberger Feld 29 51429 Bergisch Gladbach 51429 Bergisch Gladbach (DE)