(19)

(11)

EP 0 298 094 A1

(12)

(43) Date of publication: 11.01.1989 Bulletin 1989/02 (21) Application number: 88900198.0 (22) Date of filing: 01.12.1987

(51) International Patent Classification (IPC):  C12Q 1/ 04( . ) C12Q 1/ 70( . ) C12Q 1/ 10( . ) (86) International application number: PCT/US1987/003168 (87) International publication number: WO 1988/004326 (16.06.1988 Gazette 1988/13)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 01.12.1986 US 19860936515 (71) Applicant: McDONNELL DOUGLAS CORPORATION St. Louis, MO 63166-0516 (US)	(72) Inventors: HUBBARD, William, J. Franklin, TN 37064 (US) LANE, Jon, S. St. Louis, MO 63146 (US) O'BEAR, Raymond, E. Granite City, IL 62042 (US) (74) Representative: Tubby, David George, et al  MARKS & CLERK, 57-60 Lincoln's Inn Fields London WC2A 3LS London WC2A 3LS (GB)