Combined intrusion detector and alarm

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Description

FIG. 1 is a front, right side and top perspective view of a combined intrusion detector and alarm showing my new design,

FIG. 2 is a left side elevational view thereof,

FIG. 3 is a rear elevational view thereof, and

FIG. 4 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D191581 October 1961 Scharfenberg et al.
D222941 February 1972 Knutson
3623088 November 1971 Peterson
Other references
  • New Equipment Digest, Mar. 1976, p. 56, Back-up alarm.
Patent History
Patent number: D249778
Type: Grant
Filed: Apr 15, 1977
Date of Patent: Oct 3, 1978
Assignee: Hokuyo Automatic Co., Ltd. (Osaka)
Inventor: Toru Kobayakawa (Osaka)
Primary Examiner: Susan J. Lucas
Attorney: Gabriel M. Frayne
Application Number: 5/788,051
Classifications
Current U.S. Class: D10/106
International Classification: D1005;