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 our 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
Foreign Patent Documents
| 1399749 | December 1921 | Conklin |
| 1970358 | August 1934 | Bull et al. |
| 3463118 | August 1969 | Wood |
| 3708222 | January 1973 | Stern |
| 3883733 | May 1975 | Nagel |
| 4772094 | September 20, 1988 | Sheiman |
| 968412 | February 1958 | DEX |
| 2173013A | October 1986 | GBX |
Patent History
Patent number: D315807
Type: Grant
Filed: Feb 27, 1989
Date of Patent: Mar 26, 1991
Assignee: Fresnel Technologies, Inc. (Fort Worth, TX)
Inventors: Richard N. Claytor (Arlington, TX), Russell G. Torti (Fort Worth, TX)
Primary Examiner: Susan J. Lucas
Attorney: James E. Bradley
Application Number: 7/316,437
Type: Grant
Filed: Feb 27, 1989
Date of Patent: Mar 26, 1991
Assignee: Fresnel Technologies, Inc. (Fort Worth, TX)
Inventors: Richard N. Claytor (Arlington, TX), Russell G. Torti (Fort Worth, TX)
Primary Examiner: Susan J. Lucas
Attorney: James E. Bradley
Application Number: 7/316,437
Classifications
