ULTRASONIC COMMUNICATION AND SECURITY SYSTEM

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EP 0 058 721 A1

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(43)	Date of publication:
	01.09.1982 Bulletin 1982/35

(21)	Application number: 81902786.0

(22)	Date of filing: 20.08.1981

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International Patent Classification (IPC):

G08B 25/ 00^{( . )}
G08B 1/ 08^{( . )}
H04B 11/ 00^{( . )}

G08B 1/ 00^{( . )}
G08B 26/ 00^{( . )}

(86)	International application number:
	PCT/US1981/001117

(87)	International publication number:
	WO 1982/000910 (18.03.1982 Gazette 1982/08)

(84)	Designated Contracting States:
	DE FR GB NL

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Priority:

29.08.1980 US 19800182497
09.07.1981 US 19810282029

(71)	Applicant: ULTRAK INC.
	Bromfield, CO 80020 (US)

(72)	Inventor:
	HACKETT, Kenneth R. Boulder, CO 80302 (US)

(74)	Representative: Barnard, Eric Edward, et al
	BROOKES & MARTIN High Holborn House 52/54 High Holborn London WC1V 6SE London WC1V 6SE (GB)

(54)	ULTRASONIC COMMUNICATION AND SECURITY SYSTEM