(19)

(11)

EP 0 288 489 A1

(12)

(43) Date of publication: 02.11.1988 Bulletin 1988/44 (21) Application number: 87905970.0 (22) Date of filing: 20.07.1987

(51) International Patent Classification (IPC):  G01B 11/ 00( . ) G01D 5/ 30( . ) G01M 13/ 04( . ) G01B 21/ 00( . ) G01H 9/ 00( . ) (86) International application number: PCT/US1987/001670 (87) International publication number: WO 1988/000684 (28.01.1988 Gazette 1988/03)

(84) Designated Contracting States: DE FR GB (30) Priority: 18.07.1986 US 19860886827 06.02.1987 US 19870011603 (71) Applicant: PHILIPS, Gerald John Annapolis, MD 21401 (US)	(72) Inventor: PHILIPS, Gerald John Annapolis, MD 21401 (US) (74) Representative: Davies, Christopher Robert, et al  Frank B. Dehn & Co. Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)