(19)

(11)

EP 0 965 056 A1

(12)

(43) Date of publication: 22.12.1999 Bulletin 1999/51 (21) Application number: 98910128.0 (22) Date of filing: 27.02.1998

(51) International Patent Classification (IPC):  B06B 1/ 06( . ) G01S 7/ 52( . ) G01F 23/ 296( . ) (86) International application number: PCT/US1998/004075 (87) International publication number: WO 1998/038528 (03.09.1998 Gazette 1998/35)

(84) Designated Contracting States: DE ES FR GB NL (30) Priority: 27.02.1997 US 19970039389P (71) Applicant: DREXELBROOK CONTROLS, INC. Horsham, PA 19044 (US)	(72) Inventors: MALTBY, Frederick, L. Jenkintown, PA 19046 (US) FELDMAN, Alex Huntingdon Valley, PA 19006 (US) KRAMER, L., Jonathan Warminster, PA 18974 (US) LADYANSKY, Stephen, J. Philadelphia, PA 19154 (US) (74) Representative: Coyle, Philip Aidan, et al  F. R. KELLY & CO. 27 Clyde Road Ballsbridge Dublin 4 Dublin 4 (IE)