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(11)

EP 0 423 197 A1

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(43) Date of publication: 24.04.1991 Bulletin 1991/17 (21) Application number: 89908100.0 (22) Date of filing: 28.06.1989

(51) International Patent Classification (IPC):  F42B 12/ 06( . ) F42B 15/ 00( . ) F42B 12/ 62( . ) (86) International application number: PCT/US1989/002823 (87) International publication number: WO 1990/000244 (11.01.1990 Gazette 1990/02)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 28.06.1988 US 19880212450 (71) Applicant: GENERAL DYNAMICS CORPORATION Pomona CA 91769-2507 (US)	(72) Inventor: SCHRICKER, Don Blountville, TN 37617 (US) (74) Representative: Wilson, Nicholas Martin, et al  WITHERS & ROGERS 4 Dyer's Buildings Holborn London EC1N 2JT London EC1N 2JT (GB)