Wide angle fresnel lens array for infrared motion detector

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Description

The single FIGURE is a front elevational view of a wide angle fresnel lens array for infrared motion detector showing my new design, the lens array being a flat, rectangular, thin sheet having a front surface with grooves thereon and a plain, smooth, rear surface with no ornamentation.

Referenced Cited
U.S. Patent Documents
D315422 March 12, 1991 Claytor et al.
D315966 April 2, 1991 Claytor et al.
1970358 August 1934 Bull et al.
3463118 August 1969 Wood
3708222 January 1973 Stern
3883733 May 1975 Nagel
4772094 September 20, 1988 Sheiman
Foreign Patent Documents
968412 February 1958 DEX
2173013A October 1986 GBX
Patent History
Patent number: D340312
Type: Grant
Filed: Jan 24, 1991
Date of Patent: Oct 12, 1993
Assignee: Fresnel Technologies, Inc. (Fort Worth, TX)
Inventor: Richard N. Claytor (Arlington, TX)
Primary Examiner: Susan J. Lucas
Attorney: James E. Bradley
Application Number: 7/645,675