Alarm for signaling unauthorized door exit and entry

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Description

FIG. 1 is a front view of an alarm for signaling unauthorized door exit and entry of the present invention.

FIG. 2 is a left plan view of the present invention;

FIG. 3 is a top plan view of the present invention;

FIG. 4 is a right plan view of the present invention;

FIG. 5 is a bottom plan view of the present invention; and,

FIG. 6 is a rear plan view of the present invention.

Referenced Cited
U.S. Patent Documents
3233054 February 1966 Shoffstall
3340522 September 1967 Chick et al.
3435643 April 1969 Pollak et al.
3525830 August 1970 Hawkins
3530262 September 1970 Hawkins
3810091 May 1974 Hoover
4038552 July 26, 1977 Ciofalo
4584856 April 29, 1986 Petersdorff et al.
5072212 December 10, 1991 Sorenson
Other references
  • Lectric Lites Co. p. 1 Nov. 19, 1979 upper left corner (stop sign).
Patent History
Patent number: D340199
Type: Grant
Filed: Nov 13, 1989
Date of Patent: Oct 12, 1993
Assignee: Safety Technology International, Inc. (Waterford, MI)
Inventor: John D. Taylor (Waterford, MI)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Marcus Jackson
Law Firm: Gifford, Groh, Sprinkle, Patmore and Anderson
Application Number: 7/396,003
Classifications
Current U.S. Class: D10/106; D10/104