(19)

(11)

EP 0 328 545 A1

(12)

(43) Date of publication: 23.08.1989 Bulletin 1989/34 (21) Application number: 87907392.0 (22) Date of filing: 22.10.1987

(51) International Patent Classification (IPC):  F24J 2/ 38( . ) F24J 2/ 54( . ) F24J 2/ 46( . ) (86) International application number: PCT/US1987/002748 (87) International publication number: WO 1988/003635 (19.05.1988 Gazette 1988/11)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 04.11.1986 US 19860927312 (71) Applicant: Martin Marietta Corporation Bethesda Maryland 20817 (US)	(72) Inventors: FROHARDT, Melvin, Walter Littleton, CO 80122 (US) HARDEE, Patrick, Clell Aurora, CO 80010 (US) HARTZ, Keith, H. Aurora, CO 80012 (US) (74) Representative: Thomas, Roger Tamlyn, et al  D. Young & Co. 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)