Intrusion alarm

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Description

FIG. 1 is a pictorial view of the intrusion alarm embodying the novel design;

FIG. 2 is a front elevation view of the intrusion alarm of FIG. 1;

FIG. 3 is a side elevation view of the intrusion alarm of FIG. 1;

FIG. 4 is a top view of the intrusion alarm of FIG. 1; and

FIG. 5 is a rear elevation view of the intrusion alarm of FIG. 1.

Referenced Cited
Other references
  • electronic Technician/Dealer, Aug. 1968, p. 82, intrusion alarm shown. Sweets Architectural Catalog, vol. 12, 1972, Section 16.12Ae, p. 2, top of page.
Patent History
Patent number: D243513
Type: Grant
Filed: Feb 12, 1976
Date of Patent: Mar 1, 1977
Assignee: American District Telegraph Company (New York, NY)
Inventors: Aaron A. Galvin (Lexington, MA), Francis R. Keeler (Needham, MA)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Christine M. Nucker
Attorney: Joseph Weingarten
Application Number: 5/657,709
Classifications
Current U.S. Class: D10/106
International Classification: D1005;