(19)

(11)

EP 0 897 544 A1

(12)

(43) Date of publication: 24.02.1999 Bulletin 1999/08 (21) Application number: 97927606.0 (22) Date of filing: 30.04.1997

(51) International Patent Classification (IPC):  G01S 13/ 526( . ) G01S 13/ 58( . ) G01S 15/ 52( . ) G01S 13/ 22( . ) G01S 15/ 58( . ) G01S 13/ 53( . ) G01S 13/ 90( . ) G01S 13/ 20( . ) G01S 13/ 24( . ) G01S 15/ 89( . ) (86) International application number: PCT/US1997/006807 (87) International publication number: WO 1997/042520 (13.11.1997 Gazette 1997/49)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 08.05.1996 US 19960016779P 06.02.1997 US 19970796749 (71) Applicant: Andrews, Grealie A., Jr. Laurel, Maryland 20723 (US)	(72) Inventor: Andrews, Grealie A., Jr. Laurel, Maryland 20723 (US) (74) Representative: Weatherald, Keith Baynes  Castles, 17 Landsdowne Road Croydon CR0 2BX Croydon CR0 2BX (GB)