(19)

(11)

EP 0 062 056 A1

(12)

(43) Date of publication: 13.10.1982 Bulletin 1982/41 (21) Application number: 81902853.0 (22) Date of filing: 01.10.1981

(51) International Patent Classification (IPC):  G08B 13/ 24( . ) (86) International application number: PCT/US1981/001335 (87) International publication number: WO 1982/001437 (29.04.1982 Gazette 1982/11)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (30) Priority: 09.10.1980 US 19800195572 (71) Applicant: DETERRENT TECHNOLOGY CORPORATION New York, NY 10005 (US)	(72) Inventor: WILLIAMS, Harold Los Angeles, CA 90065 (US) (74) Representative: Vogeser, Werner, Dipl.-Ing., et al  Patent- und Rechtsanwälte, Hansmann Vogeser Dr. Boecker Alber Dr. Strych, Albert-Rosshaupter-Strasse 65 D-81369 München D-81369 München (DE)