Dense wide angle fresnel lens array for infrared motion detector

Details Dense wide angle fresnel lens array for infrared motion detector Dense wide angle fresnel lens array for infrared motion detector

1989-02-27

1991-03-12

Lucas, Susan J.

Lighting

Light fixture

Element or attachment

D10121

Patent

active

D03154254

REFERENCES:
patent: 1399749 (1921-12-01), Conklin
patent: 1970358 (1934-08-01), Bull et al.
patent: 3463118 (1969-08-01), Wood
patent: 3708222 (1973-01-01), Stern
patent: 3883733 (1975-05-01), Nagel
patent: 4772094 (1988-09-01), Sheiman

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