Ultrasonic intrusion detector

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Description

FIG. 1 is a perspective view of an ultrasonic intrusion detector showing our new design;

FIG. 2 is a plan view thereof on an enlarged scale;

FIG. 3 is an end view thereof on an enlarged scale; and

FIG. 4 is a plan view thereof on an enlarged scale illustrating the opposite side to that seen in FIG. 1 and FIG. 2.

Referenced Cited
U.S. Patent Documents
D219316 November 1970 Lohr
D226539 March 1973 Pearsall
Other references
  • Nutone Catalog, .COPYRGT.1979, p. 35, Ultrasonic Motion Detector.
Patent History
Patent number: D266996
Type: Grant
Filed: Feb 7, 1980
Date of Patent: Nov 23, 1982
Assignee: American District Telegraph Company (New York, NY)
Inventors: Kenneth E. Beeson (Waltham, MA), H. Patrick Thornton (Acton, MA)
Primary Examiner: Susan J. Lucas
Law Firm: Weingarten, Schurgin & Gagnebin
Application Number: 6/119,411
Classifications
Current U.S. Class: D10/106
International Classification: D1005;