Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-07-04
2006-07-04
Pyo, Kevin (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S341700, C049S026000, C340S545300
Reexamination Certificate
active
07071459
ABSTRACT:
A method for detecting interference energy in a sliding door safety system includes the steps of disposing at least one emitter along a first vertical surface, disposing at least one receiver corresponding to the at least one emitter along a second vertical surface, activating the at least one receiver, activating the at least one emitter to emit an energy beam that includes a modulated square wave of a predetermined frequency, sampling an energy intensity received by the activated at least one receiver a predetermined number of times recording each time a received energy intensity to form a plurality of recorded energy intensities, selecting the lowest magnitude one of the plurality of recorded energy intensities to form a lowest recorded energy intensity, comparing the lowest recorded energy intensity to a threshold value and determining a source of the energy intensity to be external when the lowest recorded energy intensity is less than the threshold value.
REFERENCES:
patent: 4823010 (1989-04-01), Kornbrekke et al.
patent: 4967083 (1990-10-01), Kornbrekke et al.
patent: 5641951 (1997-06-01), Cai et al.
Bachman & LaPointe P.C.
Otis Elevator Company
Pyo Kevin
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