Apparatus for monitoring or controlling the flow of persons...

Details Apparatus for monitoring or controlling the flow of persons... Apparatus for monitoring or controlling the flow of persons...

2006-03-14

2006-03-14

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C049S046000

Reexamination Certificate

active

07012244

ABSTRACT:
A detection system is disclosed comprising one or more transmitters of electromagnetic radiation and one or more cooperating receivers characterized in that at least one optical element is provided which utilizes total internal reflection to redirect the path of radiation such that the transmitter is not directly in line with the receiver.

REFERENCES:
patent: 5191219 (1993-03-01), Linke
patent: 5233185 (1993-08-01), Whitaker
patent: 5524460 (1996-06-01), Michetti et al.
patent: 5831529 (1998-11-01), Pantus
patent: 5845692 (1998-12-01), Kellem et al.
patent: 6012252 (2000-01-01), Kocznar et al.

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