Extra wide angle fresnel lens array for infrared motion detector

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

1989-02-27

1991-03-26

Lucas, Susan J.

Lighting

Light fixture

Element or attachment

D10121

Patent

active

D03158080

REFERENCES:
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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