Ultrasonic intrusion detector

Skip to: Description  ·  References Cited  · Patent History  ·  Patent History
Description

FIG. 1 is a perspective view of an ultrasonic intrusion detector embodying the design of the invention;

FIG. 2 is a top plan view on an enlarged scale of the detector of FIG. 1, the bottom plan view being identical;

FIG. 3 is a rear elevational view on an enlarged scale of the detector of FIG. 1;

FIG. 4 is a right elevational view on an enlarged scale of the detector of FIG. 1, the left elevational view being the mirror image thereof; and

FIG. 5 is a front elevational view on an enlarged scale of the detector of FIG. 1.

Referenced Cited
U.S. Patent Documents
D217037 March 1970 Weinstock
D243513 March 1, 1977 Galvin et al.
3747109 July 1973 Corbell et al.
3980998 September 14, 1976 McIntosh
Other references
  • New Equipment Digest, Nov. 1973, p. 48, Intrusion Alarm (bottom).
Patent History
Patent number: D248930
Type: Grant
Filed: Feb 16, 1977
Date of Patent: Aug 15, 1978
Assignee: Arrowhead Enterprises, Inc. (New Milford, CT)
Inventor: William G. Kahl, Jr. (Brookfield, CT)
Primary Examiner: Susan J. Lucas
Attorney: Garold E. Bramblett, Jr.
Application Number: 5/769,209
Classifications
Current U.S. Class: D10/106
International Classification: D1006;