(19)

(11)

EP 0 600 005 A1

(12)

(43) Date of publication: 08.06.1994 Bulletin 1994/23 (21) Application number: 92918730.0 (22) Date of filing: 13.08.1992

(51) International Patent Classification (IPC):  C04B 35/ 63( . ) H01B 3/ 12( . ) H01B 7/ 02( . ) C04B 35/ 583( . ) H01B 3/ 56( . ) H05B 3/ 10( . ) (86) International application number: PCT/US1992/006843 (87) International publication number: WO 1993/004485 (04.03.1993 Gazette 1993/06)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL SE (30) Priority: 13.08.1991 US 19910744309 (71) Applicant: AMERICAN TECHNOLOGY, INC. Katy, TX 77450 (US)	(72) Inventors: CANNON, Collins Kearney, MO 64060 (US) KOCH, William, J. Liberty, MO 64068 (US) (74) Representative: West, Alan Harry, et al  R.G.C. Jenkins & Co. 26 Caxton Street London SW1H 0RJ London SW1H 0RJ (GB)