(19)

(11)

EP 0 679 248 A1

(12)

(43) Date of publication: 02.11.1995 Bulletin 1995/44 (21) Application number: 94905030.0 (22) Date of filing: 11.01.1994

(51) International Patent Classification (IPC):  G01L 1/ 18( . ) (86) International application number: PCT/EP1994/000060 (87) International publication number: WO 1994/016300 (21.07.1994 Gazette 1994/17)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 15.01.1993 DE 19934300995 (71) Applicant: LUCAS INDUSTRIES PUBLIC LIMITED COMPANY Solihull, West Midlands B90 3TX (GB)	(72) Inventors: LEITER, Ralf D-56179 Vallendar (DE) ALFORD, Nick D-56220 Urmitz (DE) EICK, Rüdiger D-56283 Pfaffenheck (DE) (74) Representative: Schmidt, Steffen J., Dipl.-Ing., et al  Wuesthoff & Wuesthoff, Patent- und Rechtsanwälte, Schweigerstrasse 2 D-81541 München D-81541 München (DE)