Photoelectric smoke detector

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Description

FIG. 1 is a left side elevational view of a photoelectric smoke detector showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a side elevational view taken 90 degrees from FIG. 1;

FIG. 5 is a reduced bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D215040 August 1969 Abe
D220662 May 1971 Buhrer
D276417 November 20, 1984 Fenne
Foreign Patent Documents
1490273 July 1967 FRX
0563044 June 1975 CHX
0633122 November 1982 CHX
Other references
  • Pyrotronics, 7/1975, front page, Fire Detector, upper top of page.
Patent History
Patent number: D279872
Type: Grant
Filed: Aug 22, 1983
Date of Patent: Jul 30, 1985
Assignee: American District Telegraph Company (Jersey City, NJ)
Inventors: Hugh P. Thornton, Jr. (Acton, MA), Robert B. Powers (Norwell, MA)
Primary Examiner: B. J. Bullock
Assistant Examiner: Suzanne N. Gitlin
Attorney: James H. Grover
Application Number: 6/524,874
Classifications
Current U.S. Class: D10/106